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Azine esterification with

Diazoacetic acid silyl esters can be prepared by fra t-esterification of tert-butyl diazoacetate with trialkylsilyl triflate <1985JOM33>. Analogously prepared (alkenyloxy)silyl 203 and (alkynyloxy)silyl diazoacetates 206 underwent silicon-tethered 1,3-dipolar cycloaddition reactions as shown in Scheme 37 and Equation (38). Compound 205 resulted from a lateral criss-cross cycloaddition of the intermediate azine 204, which was formed from two molecules of 203 by diazo + diazo or diazo + carbene reaction <2000T4139>. On the other hand, when silyl diazoacetates 206 were kept in xylene at 142 °C for 1 h, bicyclic pyrazoles 207 were obtained (Equation 38). [Pg.1006]

See other pages where Azine esterification with is mentioned: [Pg.82]    [Pg.462]    [Pg.221]    [Pg.243]    [Pg.72]    [Pg.73]    [Pg.62]    [Pg.216]   
See also in sourсe #XX -- [ Pg.16 , Pg.255 ]

See also in sourсe #XX -- [ Pg.16 , Pg.255 ]



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Esterification with

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