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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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R 1<br />

R 2<br />

NH 2<br />

COOH<br />

Br<br />

a:<br />

b:<br />

c:<br />

d:<br />

e:<br />

Zn<br />

N O− R4 +<br />

H R 3<br />

H 2O<br />

R 1 R 2 R 3 R 4<br />

H<br />

Me<br />

Me<br />

Me<br />

H<br />

H<br />

H<br />

Me<br />

H<br />

H<br />

O<br />

N<br />

CH2OBn CH2OBn CH2OBn Ph<br />

O O<br />

Bn<br />

Bn<br />

Bn<br />

Me<br />

Bn<br />

Scheme 2.189<br />

B O<br />

D- or L-Alan<strong>in</strong>e Various<br />

conditions<br />

H∗HCl<br />

N<br />

Dihydrop<strong>in</strong>id<strong>in</strong>e<br />

Ph<br />

R<br />

N<br />

+<br />

O −<br />

H<br />

+<br />

−<br />

Br<br />

+<br />

+<br />

1. H 2, Pd/C<br />

2. HCl <strong>in</strong> Et2O<br />

O<br />

OH<br />

N<br />

Scheme 2.190<br />

In/THF-H2O<br />

Bu 4NBr<br />

R = C 6H 5, p-MeC 6H 4, p-ClC 6H 4<br />

Scheme 2.191<br />

NITRONE REACTIONS 287<br />

HO R<br />

N<br />

4<br />

R 1<br />

R 2<br />

Ph<br />

+<br />

R<br />

R 3<br />

N<br />

H<br />

TMSCI NIS<br />

ICH 2<br />

OH<br />

O<br />

R 1<br />

OH<br />

N<br />

N<br />

R 2<br />

R 4<br />

R 3

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