Cyclization of 1,<i>n</i>-Enynes Initiated by the Addition Reaction of <i>gem</i>-Dichromiomethane Reagents to Alkynes
作者:Masahito Murai、Ryuji Taniguchi、Kazuhiko Takai
DOI:10.1021/acs.orglett.0c01304
日期:2020.5.15
Treatment of 1,n-enynes with gem-dichromiomethane species prepared in situ from 1,1-diiodomethanes and CrCl2 gave alkenylbicycloalkanes. Alkenylcarbene species, which was generated via [2 + 2] cycloaddition with a triple bond, were intercepted by intramolecular cyclopropanation of a pendant double bond, and alkene metathesis did not proceed. This is a very rare example of transformation of alkynyl
用由1,1-二碘甲烷和CrCl2原位制备的宝石-重铬甲烷物种处理1,n-烯炔得到烯基双环烷烃。通过具有双键的[2 + 2]环加成反应生成的烯基卡宾物种被侧链双键的分子内环丙烷化作用拦截,并且烯烃复分解未进行。这是用宝石-双金属烷烃转化炔基C≡C的非常罕见的例子。由宝石-(二色)甲硅烷基和甲硼烷基甲烷产生的甲硅烷基和甲硼烷基卡宾当量促进了烯二炔和1,n-炔的偶联和环化。