Synthesis and [3+2] cycloaddition reaction of 3-[(trimethylsilylmethylamino)(methylthio)-methylene]heterocyclic compounds
作者:Yoshinori Tominaga、Satoshi Takada、Shinya Kohra、Yasumitsu Shigemitsu
DOI:10.1002/jhet.5570380519
日期:2001.9
reactions of the corresponding bis(methylthio)methylene heterocyclic compounds (2a, b), with (trimethylsilylmethyl)amine (3), were found to be synthetic equivalents of heterocyclic alkylidene-azomethine ylides. Reactions of 4a, b with reactive heterodipolarophiles such as aldehydes and ketones and reactive alkenes in the presence of cesium fluoride gave the 1,3-dipolar cycloadducts, 3-(2-oxazoli-dinylidene)-oxindole
通过相应的双(甲硫基)亚甲基杂环化合物(2a,b)与(三甲基甲硅烷基甲基)反应可轻松制备的3-[(三甲基甲硅烷基甲基氨基)(甲硫基)]亚甲基-2-香豆酮(4a)和1-甲氧基吲哚(4b)胺(3)被发现是杂环亚烷基-偶氮甲亚胺的合成等价物。在氟化铯的存在下,4a,b与反应性杂双极性亲和性化合物(如醛和酮和反应性烯烃)反应,得到1,3-双极性环加合物,3-(2-恶唑-二亚甲基)-羟吲哚和-coumaran-2-one衍生物(8a-j,9a-h)以及吡咯亚烷基香豆素-2-酮和羟吲哚衍生物(12-15,17,18),通过 (甲硫基)三甲基硅烷的1,3-消除。