Zur umsetzung von trimethylsilyl-methylen-dimethylsulfuran mit carbonylverbindungen
作者:Clemens Fleischmann、Erich Zbiral
DOI:10.1016/s0040-4020(01)93586-0
日期:1978.1
The first step in the reaction of trimethylsilylmethylene-dimethylsulfurane 1 (prepared from (CH3)3SiCH2S̄(CH3)2Ī with 1 equivalent (CH3)3COK) with carbonyl compounds (R1)(R2)CHCOCH2R32 leads Peterson-like way to the non-isolable vinylsulfoniumdimethylsilanolate-intermediate B or its recombined product A. Depending on the reaction conditions and the nature of the substituents R1, R2 and R3 there exist
在trimethylsilylmethylene-dimethylsulfurane的反应的第一个步骤1(由(CH 3)3 SICH 2 S(CH 3)2我与1当量(CH 3)3 COK)与羰基化合物(R 1)(R 2)CHCOCH 2 - [R 3根2引线彼得森状方式向非可分离vinylsulfoniumdimethylsilanolate中间乙或以其重组产物甲。取决于反应条件和取代基R 1,R 2和R 3的性质存在五种不同的途径的最终产物3 - 7。通常可以发现消除三甲基硅烷基苯胺,然后进行烯丙基取代的亚甲基-硫烷-2,3,3-三烷基-5-硫杂-1-烯3的中间体的2,3-σ重排。[CH 3 SCH 2 C(R 1)(R 2)C(CH 2 R 3)= CH 2 ]。有时通过两个当量的(CH 3)3 COK抑制这种3的形成。在这种情况下,假定的前体B脱甲基产生E,Z-乙烯基硫化物4 [CH