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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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688 NITRONATES<br />

R 3<br />

X<br />

NH<br />

Y<br />

Z<br />

471<br />

N<br />

H<br />

N<br />

* N TMS<br />

R 2<br />

LiMe<br />

TMS<br />

N<br />

*<br />

OTMS<br />

N<br />

OTMS<br />

N<br />

*<br />

R 2<br />

TMS<br />

N<br />

N<br />

Li<br />

R 2<br />

N<br />

N(OTMS) 2<br />

R 1<br />

468 A<br />

R 1<br />

434<br />

468<br />

R 3<br />

B<br />

R 1<br />

434<br />

N O<br />

O<br />

N<br />

−<br />

R 2<br />

R 1<br />

+ N<br />

*<br />

TMS<br />

R 1<br />

X<br />

N<br />

Y<br />

Z<br />

469<br />

CO2Et<br />

N(OTMS) 2<br />

Et2O EtOH<br />

Scheme 3.251<br />

N<br />

R 2<br />

R 2<br />

R 1<br />

N<br />

*<br />

OTMS<br />

N<br />

N<br />

NOTMS<br />

HO<br />

+<br />

R 2<br />

OTMS<br />

N<br />

N<br />

R 2<br />

N<br />

472<br />

R 1<br />

Ratio 469:472 from 1:9 to 4.5:1<br />

+<br />

N<br />

H<br />

469<br />

468<br />

C D<br />

CO 2Et<br />

N<br />

−<br />

36%<br />

N TMS<br />

N<br />

(1)<br />

N OH<br />

OH<br />

(2)<br />

(3)

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