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Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis : Novel ...

Nitrile Oxides, Nitrones, and Nitronates in Organic Synthesis : Novel ...

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678 NITRONATES<br />

R 2<br />

R 4 OC<br />

CHR 5<br />

R3OC 2a–e<br />

R 1<br />

Base<br />

N(OSiMe3)2<br />

[Base⋅SiMe 3]<br />

MeOOC OSiMe3<br />

CH C<br />

449<br />

R 1<br />

Me<br />

H<br />

MeO 2C(CH2)2<br />

H<br />

OMe<br />

(CH 2) 4<br />

Me<br />

H<br />

MeO 2C(CH2)2<br />

Me<br />

Me<br />

Me<br />

Base<br />

+ + OSiMe −<br />

3<br />

R 2<br />

H<br />

H<br />

H<br />

Me<br />

H<br />

Me<br />

H<br />

H<br />

H<br />

H<br />

F<br />

−<br />

R 3<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

Ph<br />

R 4 OC<br />

R3OC B<br />

R 2 N<br />

Me3SiF<br />

A<br />

CR 5<br />

R 1<br />

O<br />

[(MeOCO) 2CH]<br />

(MeOCO)2HC<br />

R 4<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OMe<br />

OEt<br />

Scheme 3.241<br />

−<br />

R 2<br />

R 2 N<br />

R 1<br />

450 c,d<br />

R 5<br />

−<br />

H<br />

H<br />

H<br />

H<br />

H<br />

Bn<br />

Bn<br />

Bn<br />

MeO2C(CH2) 2<br />

NO2<br />

H<br />

R 1<br />

R 4 OC<br />

R 3 OC<br />

O<br />

R 4<br />

O<br />

N OH<br />

450<br />

a<br />

b<br />

c<br />

d<br />

e<br />

f<br />

g<br />

h<br />

i<br />

j<br />

k<br />

R 2<br />

R 2<br />

R 5<br />

C<br />

AcOH<br />

R5 R3 O<br />

450<br />

N<br />

R 1<br />

NOH<br />

R 1<br />

Yield %<br />

90<br />

55<br />

70 (via 449)<br />

59 (via 449)<br />

33<br />

74<br />

46<br />

54<br />

50<br />

17<br />

38<br />

O −

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