A novel method for generation of enolizable N-trimethylsilylaldimines and application to β-lactam synthesis
作者:Tadao Uyehara、Ichiro Suzuki、Yoshinori Yamamoto
DOI:10.1016/s0040-4039(01)80709-7
日期:1989.1
A new method to generate N-trimethylsilylaldimines has been developedby the combination of bis(trimethylsilyl)formamide and organolithium reagents and applied successfully to β-lactamsynthesis.
The structure of bis(organosilyl) amides containing the dimethylsilyl and bis(dimethylsilyl)ethylene groups
作者:Marjorie S. Samples、Claude H. Yoder
DOI:10.1016/0022-328x(87)85124-0
日期:1987.9
to the structure of bis(trimethylsilyl) amides, which, except for the formamide, exist in the imidate form and undergo rapid exchange of trimethylsilyl groups, the bis(dimethylsilyl)amides prepared in this study exist in the amide form and undergo rapid rotation around the CN bond. The reaction of several bis(trimethylsilyl) amides with 1,2-bis(dimethylchlorosilyl)ethane also produced amides containing
与双(三甲基甲硅烷基)酰胺的结构(甲酰胺除外)以亚氨酸酯形式存在并经历三甲基甲硅烷基的快速交换相反,本研究中制备的双(二甲基甲硅烷基)酰胺以酰胺形式存在并快速发生绕CN键旋转。几种双(三甲基甲硅烷基)酰胺与1,2-双(二甲基氯甲硅烷基)乙烷的反应也产生了含有5元硅氮烷环的酰胺。通过13 C,29 Si,14 N和17 O NMR确定结构,并通过可变温度13 C或29确定用于受阻旋转的活化自由能。Si NMR。结构上的差异可归因于与硅连接的基团的空间要求。
Reactions of 1-acylamino-1-(trimethylsiloxy)alkanes: versatile precursors to acylimines
作者:A. Peter Johnson、Richard W. A. Luke、Andrew N. Boa
DOI:10.1039/p19960000895
日期:——
1-Acylamino-1-(trimethylsiloxy)alkanes react with carbon and heteroatom nucleophiles to give the corresponding 1-substituted-1-acylaminoalkanes. The 1-acylamino-1-(trimethylsiloxy)alkanes can also give rise to enamides, and by this route the mild antibiotic tuberin, and the isomeric (Z)-tuberin have been prepared. A further example of their reactions is illustrated with the acid-catalysed intramolecular cyclisation onto a carbon–carbon double bond. These transformations show that 1-acylamino-1-(trimethylsiloxy)alkanes are versatile precursors to synthetically useful acylimines.
Process for the preparation of .beta.-lactam compounds
申请人:Beecham Group p.l.c.
公开号:US04555363A1
公开(公告)日:1985-11-26
A process for the preparation of a .beta.-lactam having the partial structure (I): ##STR1## wherein R.sub.1 is an acyl group, which process comprises treating an imine having the partial structure (II): ##STR2## with a nucleophilic derivative of formamide.
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.