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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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HO<br />

R<br />

R<br />

R<br />

HO<br />

N Bn<br />

NHBoc<br />

NH 2<br />

NHBoc<br />

NH2<br />

R 1<br />

R 1<br />

R<br />

N Bn O +<br />

NHBoc<br />

H<br />

R 1 MgBr<br />

R<br />

R<br />

HO<br />

R<br />

NITRONE REACTIONS 247<br />

N Bn<br />

NHBoc<br />

R 1<br />

NH 2<br />

NHBoc<br />

R 1<br />

NH2 • 2HCl<br />

NH2 •<br />

R 1<br />

R = Me, i Pr, Bn; R 1 = Me, Ph<br />

OH<br />

*<br />

NH2<br />

OH<br />

i<br />

ii<br />

−<br />

i<br />

ii<br />

NH 2<br />

R 1<br />

2HCl<br />

i: H 2, Pd(OH) 2-C, MeOH, r.t., 70 psi, 72 h<br />

ii: 8% HCl - MeOH, 5°C, 30 m<strong>in</strong><br />

Scheme 2.142<br />

HO<br />

−<br />

OH<br />

NH2<br />

R 1 O<br />

OR 1<br />

CH2OH LiCH 2OR 2<br />

Fig. 2.24<br />

+<br />

O<br />

−<br />

N<br />

+ Bn

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