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Scheme 3.1 Classification of ene reactions................................................................................... 30 Scheme 3.2 Transition metal-catalyzed ene-type cycloisomerization of enynes. ........................ 31 Scheme 3.3 Pd(II)-catalyzed cycloisomerization of enynes......................................................... 32 Scheme 3.4 Rh(I)-catalyzed cycloisomerization of enynes.......................................................... 33 Scheme 3.5 Allenic cycloisomerization reported by Malacria. .................................................... 33 Scheme 3.6 Allenic cycloisomerization reported by Sato. ........................................................... 34 Scheme 3.7 Rh(I)-catalyzed allenic Alder-ene reaction. .............................................................. 34 Scheme 3.8 Mechanism of the Rh(I)-catalyzed allenic Alder-ene reaction. ................................ 35 Scheme 3.9 Examples of Rh(I)-catalyzed allenic Alder-ene reaction. ......................................... 36 Scheme 3.10 Allenic Alder-ene reaction of 73a........................................................................... 37 Scheme 3.11 1 H NMR of 111a (olefin region, CDCl3, rt, 300 MHz)........................................... 37 Scheme 3.12 Preparation of polysubstituted trienes 111j-111l. ................................................... 39 Scheme 3.13 Mechanistic rationale for the exclusive E geometry of 111l................................... 40 Scheme 3.14 Proposed cycloisomerization to form enol-ether trienes......................................... 41 Scheme 3.15 Synthesis of cycloisomerization precursors 122a-c................................................ 43 Scheme 3.16 Cycloisomerization of 122a and 122b. ................................................................... 44 Scheme 3.17 Cycloisomerization of allenic alcohol 122c............................................................ 45 Scheme 3.18 Tandem Diels-Alder reactions of acyclic cross-conjugated trienes........................ 46 Scheme 3.19 Tandem cycloadditions of [4]-dendralene reported by Willis. ............................... 47 Scheme 3.20 Diels-Alder reactions of triene 111. ........................................................................ 48 Scheme 3.21 Intermolecular Diels-Alder reaction of 111f........................................................... 49 Scheme 3.22 Novel fused bicyclic Diels-Alder precursor 147..................................................... 50 Scheme 3.23 Transition metal-catalyzed formation of γ-lactams................................................. 51 xiv
Scheme 3.24 Preparation of amide-tethered allenynes................................................................. 52 Scheme 3.25 Amide bond rotamers of 145a................................................................................. 54 Scheme 3.26 Preparation and cycloisomerization of 145e. .......................................................... 54 Scheme 3.27 Synthesis of novel imino-oxazolidinone trienes 155a and 155b. ........................... 55 Scheme 3.28 Diels-Alder reaction of imino-oxazolidinones 155a and 155b............................... 57 Scheme 3.29 Hetero Diels-Alder reaction of 156a with ethyl vinyl ether.................................... 58 Scheme 3.30 Reaction of 156a with benzylamine........................................................................ 59 Scheme 3.31 Reduction and functionalization of 156a and 156b. ............................................... 60 Scheme 3.32 Synthesis of a library of polycyclic scaffolds from cross-conjugated trienes......... 63 Scheme 3.33 Rh(I)-catalyzed [4+2] cycloaddition of cross-conjugated trienes........................... 64 Scheme 3.34 Synthesis of trieneyne 174. ..................................................................................... 64 Scheme 3.35 Attempted Rh(I)-catalyzed cycloadditions of 174. ................................................. 65 Scheme 3.36 Unexpected formation of γ-butenolide 178............................................................. 66 Scheme 3.37 Synthesis of carboxylic acid 177............................................................................. 67 Scheme 3.38 Rh(I)-catalyzed rearrangement of acid 177............................................................. 68 Scheme 3.39 Synthesis of thermal Diels-Alder precursor 184..................................................... 68 Scheme 3.40 Ester bond rotamers of 184. .................................................................................... 69 Scheme 3.41 Cycloisomerization of ene-allenes. ......................................................................... 72 Scheme 3.42 Formation of tetrahydroazepine 189. ...................................................................... 73 Scheme 3.43 Selected data from the 1 H NMR spectrum of 189 in CDCl3................................... 73 Scheme 3.44 Type III intramolecular ene reaction....................................................................... 74 Scheme 3.45 Proposed mechanisms of the Rh(I)-catalyzed cycloisomerization of ene-allene 75a. ....................................................................................................................................................... 75 xv
Page 1 and 2: TRANSITION METAL-CATALYZED REACTION
Page 3 and 4: Transition Metal-Catalyzed Reaction
Page 5 and 6: List of Abbreviations Ac acetyl AcO
Page 7 and 8: Table of Contents 1.0 Introduction.
Page 9 and 10: Appendix A : X-ray crystal structur
Page 11 and 12: Table 4.8 Rh(I)-catalyzed cyclocarb
Page 13: List of Schemes Scheme 1.1 Three fo
Page 17 and 18: Scheme 4.16 Formation of bicyclo[5.
Page 19 and 20: 1.0 Introduction 1.1 The Role of Di
Page 21 and 22: According to these guidelines, the
Page 23 and 24: Scheme 1.1 Three forms of diversity
Page 25 and 26: Another example from the Schreiber
Page 27 and 28: 1.1.1 Transition Metal-Catalyzed Re
Page 29 and 30: 37, , such reactions include transi
Page 31 and 32: the proximal olefin of allenyne 38
Page 33 and 34: 2.0 Design and Synthesis of the Piv
Page 35 and 36: The allenic amino acid derivatives
Page 37 and 38: This protocol proved particularly u
Page 39 and 40: ZnCl2, which results in a Zn-chelat
Page 41 and 42: Scheme 2.7 Synthesis of trisubstitu
Page 43 and 44: THF), the yield was increased from
Page 45 and 46: the terminus of the alkyne led to d
Page 47 and 48: N-Alkylation of the glycine-derived
Page 49 and 50: circumvent this issue, variants suc
Page 51 and 52: BINAP as a chiral ligand to obtain
Page 53 and 54: stereochemistry of the exocyclic ol
Page 55 and 56: 3.2 Rhodium(I)-Catalyzed Allenic Cy
Page 57 and 58: exocyclic olefin geometry is not re
Page 59 and 60: 3.2.1 Preparation of Enol-ether Tri
Page 61 and 62: Scheme 3.15 Synthesis of cycloisome
Page 63 and 64: Scheme 3.17 Cycloisomerization of a
Page 65 and 66:
Scheme 3.19 Tandem cycloadditions o
Page 67 and 68:
Scheme 3.21 Intermolecular Diels-Al
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attractive, since additional functi
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increased yield of the triene (47%)
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as an isobutyl-amide 155b was prepa
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group) demonstrated that this cyclo
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in 1M HCl/dioxane (1 : 1) for 1h, t
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ppm (dd, J = 7.1, 4.6 Hz, 1H) assig
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http://ccc.chem.pitt.edu/). Using f
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Notably, exclusive cycloisomerizati
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intermediate in the reaction we sou
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epulsive dipole interactions (Schem
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Table 3.4 Diels-Alder reactions of
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allenic Alder-ene reaction, ene-all
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Figure 3.4 Examples of natural prod
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species onto the proximal double bo
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Scheme 3.49 Rh(I)-catalyzed ene rea
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y Magnus 144 and it involves the in
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usually is DMSO. Heating to 100 ºC
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that require high pressures of CO.
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In contrast to the Mo(CO)6-mediated
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Scheme 4.15 Rh(I)-catalyzed allenic
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4.2 Rhodium(I)-Catalyzed Cyclocarbo
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lack of double bond selectivity, si
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Table 4.2 Cyclocarbonylation reacti
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Notably, the allenic cyclocarbonyla
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Scheme 4.22 Cyclocarbonylation reac
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neat or in solution. This decomposi
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the newly synthesized fulvenes (e.g
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stereocenters and mixture of E/Z is
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proximal double bond to give α-alk
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the methyl ester and Ha are syn. Sc
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that the major diastereomer in the
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We were motivated to first examine
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Scheme 4.42 Synthesis of pyrrole 29
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periodic acid (H5IO6). 209 These hi
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eaction failed to go to completion,
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4.5.2 Synthesis of a Library of Tri
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diketones 312{1-3,1-2} in yields ra
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Figure 4.2 Distribution for physico
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tricyclic pyrrole 314{3,2,26} (Figu
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4.6 Synthesis of α-Alkylidene Cycl
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anched and linear carboxylic acid i
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eactivity of the species prepared i
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considerably lower than the ratio o
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diastereomer. Next, allenyne 328 wa
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Conclusions In summary, we have dem
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Experimental Section General Method
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General procedure A for esterificat
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F Bz N H 56f 2-Benzoylamino-3-(4-fl
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MeO2C Bz N H 58c 2-Benzoylamino-2-m
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MeO MeO2C Bz N H 58e 2-Benzoylamino
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mL) and MeOH (10 mL) instead of sat
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hexanes-EtOAc, 19 : 1 to 4 : 1, v/v
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which was immediately used in the C
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Boc TMS N H Bn 64f tert-Butyl-1-((4
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MeI (38 µL, 0.62 mmol). Yield 65a
Page 179 and 180:
with brine and concentrated under v
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H MeO 2C • H Bn NHBoc tert-Butyl-
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TMS MeO 2C • 70 H H NHBoc 2-tert-
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185 (10), 141 (21), 57 (100); EI-HR
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dispersion in mineral oil, 1.0 mmol
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EI-HRMS calcd for C30H26NO3 m/z [M-
Page 191 and 192:
CbzN MeO 2C Me 73h 2-[Benzyloxycarb
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CbzN MeO 2C Me 2-(Benzyloxycarbonyl
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dispersion in mineral oil, 3.85 mmo
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completion of the addition, the rea
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BzN MeO 2C S 74h 2-(Benzoylprop-2-y
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BzN MeO 2C Bn 75b 2-(Allylbenzoylam
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BzN MeO 2C TBSO 75e 2-(Benzoylbut-2
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Hz, 1H), 5.85 (s, 1H), 5.52 (dd, J
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1H), 3.69 (s, 3H), 1.58 (d, J = 7.1
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µmol), [Rh(CO)2Cl]2 (1 mg, 3 µmol
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1.25 (m, 6H), 0.88 (t, J = 6.9 Hz,
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6.72 (d, J = 7.6 Hz, 0.5H), 6.68 (d
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BzN MeO2C Bn 122a Methyl-2-(N-(but-
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Bz N MeO2C Bn 1-Benzoyl-2-benzyl-4-
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13.9, 5.3 Hz, 1H), 2.51-2.47 (m, 1H
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15 min the solvent was removed unde
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Benzoyl chloride (0.169 mL, 1.46 mm
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mg, 0.11 mmol), [Rh(CO)2Cl]2 (4 mg,
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mL). kk The aqueous layer was extra
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ºC. After quenching the reaction b
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129.8, 129.0, 128.7, 128.4, 126.2,
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MeO 2C O O O N H N R 1 O N Ph [10c-
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The crude residue was purified by f
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14.4 Hz, 1H), 3.49-3.39 (m, 2H), 3.
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1H), 5.49 (dd, J = 17.3, 1.8 Hz, 1H
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was stirred at rt for 1 h when it w
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BzN HOOC 2-(N-(but-2-ynyl)benzamido
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°C and DIBAL-H (0.440 mL of a 1.0M
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129 (62), 91 (100); EI-HRMS calcula
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(d, J = 18.0 Hz, 1H), 4.14 (d, J =
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4.98 (dt, J = 7.7, 5.1 Hz, 1H), 4.1
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N Bz MeO2C OTBS 214 1-Benzoyl-2-(te
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270a (major diastereomer-eluting fi
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CDCl3): δ 7.42-7.17 (m, 13H), 7.04
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18.6 Hz, 1H), 4.34 (d, J = 18.0 Hz,
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Bz N MeO2C 2-Benzoyl-3,7-dimethyl-6
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v/v) afforded a mixture of compound
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(435 mg, 1.21 mmol), DMSO (429 µL,
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4.02 (s, 1H), 3.88 (s, 3H), 1.82 (s
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(207 mg, 96%) consisting of 287e (7
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procedure O, using: 74f (110 mg, 0.
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Bz N O H CO2Me BocN 287i 3-(2-Benzo
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4.17 (d, J = 15.0 Hz, 1H), 4.10 (d,
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137.1, 136.9, 130.4, 129.8, 128.5,
Page 279 and 280:
H BzN MeO2C Bn H N C3H7 298b CO 2Me
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NMR (75 MHz, CDCl3): δ 172.3, 169.
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following the general procedure Q,
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H BzN MeO2C Bn H 5-Benzoyl-1,4-dibe
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119.9, 114.1, 109.9, 108.6, 73.0, 5
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4.11 (m, 1H), 4.07-3.98 (m, 1H), 3.
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126.8, 126.2, 109.0, 72.9, 58.7, 56
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NMR (75 MHz, CDCl3): δ 172.2, 169.
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3.0 Hz, 1H), 5.82-5.80 (m, 1H), 5.2
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87%). The diastereomeric ratio (288
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APPENDIX A: X-ray crystal structure
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APPENDIX B: X-ray crystal structure
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APPENDIX C: X-ray crystal structure
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APPENDIX D: X-ray crystal structure
Page 307 and 308:
APPENDIX E: X-ray crystal structure
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APPENDIX F: QikProp property predic
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1 H and 13 C NMRs of 74b 293
Page 313 and 314:
1 H and 13 C NMRs of 111a 295
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
1 H and 13 C NMRs of 270h 303
Page 323 and 324:
Page 325 and 326:
1 H and 13 C NMRs of 307 307
Page 327 and 328:
1 H and 13 C NMRs of 308n 309
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10. (a) Burke, M. D.; Schreiber, S.
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Hu, Y. J. Comb. Chem. 2006, 8, 286.
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49. For reviews on reactions of all
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69. (a) Trost, B. M.; Lautens, M.;
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containing cross-conjugated trienes
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Vaillancourt, J.; Rasper, D. M.; Ta
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130. Oppolzer, W.; Snieckus, V. Ang
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149. (a) Hicks, F. A.; Buchwald, S.
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Maiese, W. M. J. Antibiot. 2000, 53
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192. The mechanism of decomposition
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Boger, D. L.; Boyce, C. W.; Labroli
Page 351:
Generated Inhibitors of Human Mitog
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