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

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R<br />

R<br />

R<br />

R<br />

188<br />

189<br />

NHOH<br />

a: R = Me<br />

b: R = Me 3Si<br />

NaCNBH3 pH 3-4<br />

NHOH<br />

a: R = Me<br />

b: R = Me 3Si<br />

c: R = H<br />

b: R = Me3Si<br />

pH 3-4<br />

NaCNBH3<br />

c: R = H<br />

b: R = Me 3Si<br />

R1O2C C N + RNHOH<br />

193<br />

20°C<br />

1 h<br />

69%<br />

cis (22%); trans (38%)<br />

NOH<br />

NHOH<br />

Scheme 2.67<br />

CH2Cl2<br />

r.t.<br />

SYNTHESIS OF NITRONES 181<br />

toluene<br />

reflux<br />

OH<br />

N<br />

−<br />

O<br />

N<br />

+<br />

81% (from 189c)<br />

50% (from 189b)<br />

−<br />

Scheme 2.68<br />

O<br />

N C<br />

R CO2R1 NH2<br />

+<br />

194<br />

or<br />

N<br />

O<br />

192<br />

190<br />

191<br />

+<br />

−<br />

RO<br />

N<br />

C<br />

CO2R1 NH2

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