An improved process for the trimethylsilylation of organic compounds with at least one active hydrogen atom with hexamethyldisilazane, the improvement comprising effecting the reaction in the presence of 0.001 to 10 mole percent of a catalyst of the formula X--NH--Y I wherein X and Y are individually an electron-withdrawing group or when X is an electron-withdrawing group, Y is selected from the group consisting of hydrogen and trialkylsilyl of 1 to 6 carbon atoms or X and Y together with the nitrogen atom to which they are attached form a cyclic electron-withdrawing group and novel trimethylsilylated thiols of the formula ##STR1## wherein R is a 5-or 6-membered heterocycle having at least one nitrogen or sulfur heteroatom and optionally substituted with at least one member of the group consisting of alkyl of 1 to 6 carbon atoms, phenyl, trimethylsilyl, trimethylsilyloxycarbonylmethyl and alkylamino of 1 to 6 carbon atoms, and novel trimethylsilylated 3'-substituted cephalosporanic acid derivatives.
Derkach,N.Ya.; Smetankina,N.P., Journal of general chemistry of the USSR, 1964, vol. 34, p. 3660 - 3662
作者:Derkach,N.Ya.、Smetankina,N.P.
DOI:——
日期:——
SCHWARZ, G.;ALBERTS, H.;KRICHELDORF, H. R., LIEBIGS ANN. CHEM., 1981, N 7, 1257-1270
作者:SCHWARZ, G.、ALBERTS, H.、KRICHELDORF, H. R.
DOI:——
日期:——
Catalysts for silylations with 1,1,1,3,3,3-hexamethyldisilazane
作者:Cornelis A. Bruynes、Theodorus K. Jurriens
DOI:10.1021/jo00141a031
日期:1982.9
Process for preparing 3'bromo-desacetoxycephalosporanic acid sulfoxide
申请人:Gist-Brocades N.V.
公开号:US04366315A1
公开(公告)日:1982-12-28
An improved process for the preparation of 3'-bromo-desacetoxycephalosphoranic acid sulfoxide compounds comprising protecting the 4-carboxy group of a 3'-unsubstituted cephalosporanic acid sulfoxide by silylating in an inert anhydrous organic solvent and brominating the silylated compound in situ which 3'-bromo compounds are valuable intermediates for the preparation of therapeutically useful cephalosporanic acid compounds.