7.50-7.45 (m, 5H), 7.31-7.27 (m, 3H), 7.16-7.14 (m, 2H), 5.91 (s, 1H), 4.24 (d, J = 15.5 Hz, 1H), 4.08 (d, J = 14.1 Hz, 1H), 4.06 (d, J = 15.5 Hz, 1H), 3.76 (s, 3H), 3.55 (s, 1H), 3.28 (d, J = 14.2 Hz, 1H), 3.04 (dd, J = 18.5, 5.0 Hz, 1H), 2.84 (dd, J = 18.5, 3.6 Hz, 1H), 2.49 (t, J = 7.2 Hz, 2H), 2.15 (q, J = 4.2 Hz, 1H), 1.66 (sex, J = 7.3 Hz, 2H), 0.98 (t, J = 7.3 Hz, 3H); 13 C NMR (75 MHz, CDCl3): δ 208.4, 207.6, 173.7, 171.5, 171.3, 135.9, 135.7, 131.0, 130.5, 128.6, 128.4, 127.2, 124.1, 123.7, 123.3, 71.6, 53.2, 52.5, 51.7, 45.9, 44.4, 40.6, 37.6, 17.0, 13.7; IR (thin film): ν 2960, 1713, 1645, 1383 cm -1 ; MS m/z (%) 459 (7), 388 (58), 358 (54), 298 (78), 105 (100); EI- HRMS calcd for C28H29NO5 m/z [M] + 459.2046, found 459.2061. General procedure Q for reduction <strong>of</strong> enones. BzN Bn MeO 2C H 2-Benzoyl-1-benzyl-4-methyl-5-oxo-6-(2-oxopentyl)octahydrocyclopenta[c]pyrrole-1- H 296 carboxylic acid methyl ester (296). To a solution <strong>of</strong> the enone 293a (121 mg, 0.256 mmol) in MeOH (15 mL) was added Pd/C (100 mg <strong>of</strong> 10 % by wt.) at rt. The reaction vessel was connected to a hydrogenation apparatus and purged with H2 three times. The reaction mixture was stirred at rt under H2 pressure (2.5 atm) for 4 h. The mixture was then filtered using a fritted funnel through a plug <strong>of</strong> celite and washed with CH2Cl2. The filtrate was concentrated under vacuum to afford 296 (115 mg, 95%). 1 H NMR (300 MHz, CDCl3): δ 7.47-7.42 (m, 5H), 7.34-7.24 (m, 5H), 4.22 (d, J = 13.8 Hz, 1H), 3.84 (s, 3H), 3.27 (d, J = 13.8 Hz, 1H), 3.20-3.00 (m, 3H), 2.85 (dd, J = 10.2, 6.9 Hz, 1H), 2.63- 2.46 (m, 3H), 2.39 (t, J = 7.3 Hz, 2H), 1.79-1.68 (m, 1H), 1.61 (sex, J = 7.4 Hz, 2H), 0.94 (t, J = 7.3 Hz, 3H), 0.75 (d, J = 7.3 Hz, 3H); 13 C NMR (75 MHz, CDCl3): δ 218.2, 208.6, 171.9, 169.9, 258 O O C 3H 7
137.1, 136.9, 130.4, 129.8, 128.5, 127.1, 126.1, 72.8, 52.6, 51.5, 50.3, 44.4, 44.2, 44.0, 41.6, 41.4, 39.8, 17.2, 13.6, 10.2; IR (thin film): ν 2962, 1737, 1712, 1639, 1404, 1250 cm -1 ; MS m/z (%) 416 (16), 384 (43), 352 (21), 324 (23), 105 (100); EI-HRMS calcd for C27H30NO3 m/z [M- 59] + 416.2226, found 416.2239. H BzN Bn MeO 2C H 297 2-Benzoyl-1-benzyl-5-oxo-6-(2-oxopentyl)octahydrocyclopenta[c]pyrrole-1-carboxylic acid methyl ester (297). Prepared by following the general procedure Q, using: 294a (140 mg, 0.305 mmol), MeOH (10 mL), Pd/C (50 mg <strong>of</strong> 10% by wt.), H2 (1 atm). The reaction mixture was stirred for 4 h at rt. Yield <strong>of</strong> 297 (140 mg, >95%). Note: The reaction was performed under 1 atm <strong>of</strong> H2 using a balloon. 1 H NMR (300 MHz, CDCl3): δ 7.49-7.24 (m, 10H), 4.18 (d, J = 13.7 Hz, 1H), 3.83 (s, 3H), 3.37- 3.12 (m, 3H), 2.96-2.88 (m, 2H), 2.66-2.57 (m, 2H), 2.43 (t, J = 7.3 Hz, 2H), 2.33 (dd, J = 19.0, 8.3 Hz, 1H), 1.99 (d, J = 19.0 Hz, 1H), 1.89-1.77 (m, 1H), 1.64 (sex, J = 7.3 Hz, 2H), 0.96 (t, J = 7.3 Hz, 3H); 13 C NMR : δ 216.6, 208.4, 171.8, 169.6, 137.0, 136.7, 130.5, 129.9, 128.5, 127.1, 126.2, 72.9, 56.5, 52.6, 52.2, 45.1, 44.5, 41.6, 39.6, 36.1, 17.2, 13.6; IR (thin film): ν 2959, 1740, 1712, 1636, 1405, 1250 cm -1 ; EI-HRMS calcd for C26H28NO3 m/z [M-59] + 402.2069, found 402.2069. 259 O O C 3H 7
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TRANSITION METAL-CATALYZED REACTION
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Transition Metal-Catalyzed Reaction
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List of Abbreviations Ac acetyl AcO
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Table of Contents 1.0 Introduction.
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Appendix A : X-ray crystal structur
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Table 4.8 Rh(I)-catalyzed cyclocarb
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List of Schemes Scheme 1.1 Three fo
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Scheme 3.24 Preparation of amide-te
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Scheme 4.16 Formation of bicyclo[5.
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1.0 Introduction 1.1 The Role of Di
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According to these guidelines, the
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Scheme 1.1 Three forms of diversity
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Another example from the Schreiber
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1.1.1 Transition Metal-Catalyzed Re
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37, , such reactions include transi
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the proximal olefin of allenyne 38
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2.0 Design and Synthesis of the Piv
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The allenic amino acid derivatives
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This protocol proved particularly u
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ZnCl2, which results in a Zn-chelat
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Scheme 2.7 Synthesis of trisubstitu
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THF), the yield was increased from
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the terminus of the alkyne led to d
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N-Alkylation of the glycine-derived
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circumvent this issue, variants suc
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BINAP as a chiral ligand to obtain
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stereochemistry of the exocyclic ol
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3.2 Rhodium(I)-Catalyzed Allenic Cy
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exocyclic olefin geometry is not re
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3.2.1 Preparation of Enol-ether Tri
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Scheme 3.15 Synthesis of cycloisome
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Scheme 3.17 Cycloisomerization of a
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Scheme 3.19 Tandem cycloadditions o
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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
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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-
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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
- Page 225 and 226: mg, 0.11 mmol), [Rh(CO)2Cl]2 (4 mg,
- Page 227 and 228: mL). kk The aqueous layer was extra
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- Page 231 and 232: 129.8, 129.0, 128.7, 128.4, 126.2,
- Page 233 and 234: MeO 2C O O O N H N R 1 O N Ph [10c-
- Page 235 and 236: The crude residue was purified by f
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- Page 239 and 240: 1H), 5.49 (dd, J = 17.3, 1.8 Hz, 1H
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- Page 253 and 254: N Bz MeO2C OTBS 214 1-Benzoyl-2-(te
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- Page 259 and 260: 18.6 Hz, 1H), 4.34 (d, J = 18.0 Hz,
- Page 261 and 262: Bz N MeO2C 2-Benzoyl-3,7-dimethyl-6
- Page 263 and 264: v/v) afforded a mixture of compound
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- Page 267 and 268: 4.02 (s, 1H), 3.88 (s, 3H), 1.82 (s
- Page 269 and 270: (207 mg, 96%) consisting of 287e (7
- Page 271 and 272: procedure O, using: 74f (110 mg, 0.
- Page 273 and 274: Bz N O H CO2Me BocN 287i 3-(2-Benzo
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- Page 279 and 280: H BzN MeO2C Bn H N C3H7 298b CO 2Me
- Page 281 and 282: NMR (75 MHz, CDCl3): δ 172.3, 169.
- Page 283 and 284: following the general procedure Q,
- Page 285 and 286: H BzN MeO2C Bn H 5-Benzoyl-1,4-dibe
- Page 287 and 288: 119.9, 114.1, 109.9, 108.6, 73.0, 5
- Page 289 and 290: 4.11 (m, 1H), 4.07-3.98 (m, 1H), 3.
- Page 291 and 292: 126.8, 126.2, 109.0, 72.9, 58.7, 56
- Page 293 and 294: NMR (75 MHz, CDCl3): δ 172.2, 169.
- Page 295 and 296: 3.0 Hz, 1H), 5.82-5.80 (m, 1H), 5.2
- Page 297 and 298: 87%). The diastereomeric ratio (288
- Page 299 and 300: APPENDIX A: X-ray crystal structure
- Page 301 and 302: APPENDIX B: X-ray crystal structure
- Page 303 and 304: APPENDIX C: X-ray crystal structure
- Page 305 and 306: APPENDIX D: X-ray crystal structure
- Page 307 and 308: APPENDIX E: X-ray crystal structure
- Page 309 and 310: APPENDIX F: QikProp property predic
- Page 311 and 312: 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: 1 H and 13 C NMRs of 155a 297
- Page 317 and 318: 1 H and 13 C NMRs of 156a 299
- Page 319 and 320: 1 H and 13 C NMRs of 186b 301
- Page 321 and 322: 1 H and 13 C NMRs of 270h 303
- Page 323 and 324: 1 H and 13 C NMRs of 287b 305
- Page 325 and 326: 1 H and 13 C NMRs of 307 307
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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
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Generated Inhibitors of Human Mitog