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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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#<br />

N<br />

CO2Me<br />

OSi<br />

OMe<br />

SiO<br />

N<br />

CO2Me<br />

OSi<br />

SiO<br />

N<br />

CO2Me O-Si<br />

OMe<br />

SiO<br />

H<br />

H<br />

MeOH<br />

H<br />

R<br />

R<br />

CO2Me<br />

R<br />

O<br />

H OMe<br />

−MeOSi<br />

O<br />

385<br />

H<br />

O H<br />

H<br />

Me<br />

H<br />

Si – SiMe 3<br />

(1)<br />

always<br />

SILYLATION OF NITRO COMPOUNDS AS A PROCESS 647<br />

MeO OH<br />

MeO 2C R<br />

O<br />

MeOH<br />

N<br />

OSi<br />

MeO2C<br />

NO 2<br />

MeO 2C<br />

–MeOSi<br />

382<br />

~100%<br />

CO 2Me<br />

MeO 2C<br />

OSi<br />

OSi<br />

N<br />

SiO<br />

N O<br />

N O<br />

CO 2Me<br />

CO 2Me<br />

R<br />

H<br />

PhHC N(O)O− 385<br />

or Si<br />

PhHC N<br />

or<br />

SiOSi<br />

DBU<br />

PhCH 2NO 2<br />

O<br />

CO2Me<br />

R<br />

CO2Me<br />

R<br />

OSi −<br />

−DBUH +<br />

H<br />

OSi<br />

NO2<br />

−<br />

O<br />

N O<br />

CO2Me<br />

Ph<br />

N<br />

CO 2Me<br />

Ph<br />

[PhCH(NO2)] −<br />

a: – R = Ph (67%)<br />

b: – R = p–NO2–C6H4 (44%)<br />

CO 2Me<br />

R<br />

CO 2Me<br />

R<br />

(2)<br />

H<br />

386a,b<br />

Scheme 3.217

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