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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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342 NITRONES: NOVEL STRATEGIES IN SYNTHESIS<br />

BnO<br />

O− NR1R2 62 a-c<br />

N +<br />

Bn<br />

COOMe<br />

adduct R 1 R 2<br />

a Bn Bn<br />

b Cbz H<br />

c Boc H<br />

N+<br />

O −<br />

154<br />

H<br />

N<br />

573<br />

OBn<br />

OH<br />

OBn<br />

OH<br />

OH<br />

+<br />

Bn2N<br />

NR 1 R 2 NR 1 R 2<br />

Bn<br />

N O<br />

COOMe<br />

+<br />

Bn<br />

565 a-c 566 a-c<br />

NR 1 R 2<br />

Bn<br />

N O<br />

COOMe<br />

Bn<br />

567 a-c 568 a-c<br />

Bn<br />

569<br />

COOMe<br />

N O<br />

Scheme 2.262<br />

COX<br />

X = OMe<br />

X = NMe 2<br />

H<br />

HO OH<br />

N<br />

572<br />

OH<br />

OH<br />

CH2Cl2<br />

rt<br />

Scheme 2.263<br />

+<br />

XOC<br />

XOC<br />

NR 1 R 2<br />

H<br />

H<br />

N O<br />

N O<br />

H<br />

O N<br />

570 a (56%)<br />

571 (78%)<br />

H<br />

O N<br />

+<br />

COOMe<br />

+<br />

COOMe<br />

OBn<br />

OBn<br />

570 b (23%)<br />

+<br />

OBn<br />

OBn<br />

OBn<br />

OBn

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