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

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[R1R2C(NO2)] − + M R3<br />

178 175 (R 3 =Ph)<br />

175 (R 3 =Bu)<br />

R 1 R 2 M<br />

a: H Me Na<br />

b: Me Me Na<br />

c: H C(O)NMe2 K<br />

d: H C(O)NHMe K<br />

e: H CO2Me K<br />

Ph<br />

N<br />

NC6H4R-p<br />

R 3<br />

R 1<br />

+<br />

+<br />

N O<br />

SYNTHESIS OF NITRONES 179<br />

NO R 1 R 2 C N<br />

Scheme 2.63<br />

C6H4R 2 -p<br />

NO 2<br />

-M + NO2 −<br />

R 1 R 2 C N<br />

180 181 182<br />

R = H, Me R 1 = H, Me<br />

R 3 = NMe2<br />

179<br />

R 3<br />

O M<br />

R 3<br />

O<br />

R1 R2 R3 a: H Me Ph<br />

b: Me Me<br />

c: H C(O)NMe2 d: H C(O)NHMe<br />

e: H CO2Me But f: H C(O)NMe But g: H C(O)NHMe But Ph<br />

Ph<br />

Ph<br />

R 1<br />

Ph<br />

N +<br />

N<br />

−<br />

O<br />

R 3<br />

R 2 = H, Me R 3 = NMe2<br />

+<br />

−<br />

−<br />

C6H4R-p<br />

N<br />

a: R = R 1 = R 2 = H; b: R = Me, R 1 = R 2 = H; c: R = Cl, R 1 = R 2 = H<br />

d: R = Br, R 1 = R 2 = H; e: R = R 1 = H, R 2 = Me; f: R = R 2 = Me, R 1 = H<br />

g: R = Cl, R 1 = H, R 2 = Me; h: R = Br, R 1 = H, R 2 = Me; i: R = R 1 = Me, R 2 = H<br />

j: R = R 1 = R 2 = Me<br />

Scheme 2.64<br />

+<br />

R 2

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