A new synthesis of cyanocyclopropanes by the intramolecular alkylation of magnesium carbenoids as the key reaction
作者:Hideki Saitoh、Tsuyoshi Satoh
DOI:10.1016/j.tetlet.2010.04.090
日期:2010.6
Addition reaction of 1-chlorovinyl p-tolyl sulfoxides, derived from ketones and chloromethyl p-tolyl sulfoxide, with cyanomethyllithium gave adducts in quantitative yields. Treatment of the adducts with i-PrMgCl in THF resulted in the formation of cyanocyclopropanes via the intramolecular alkylation of the generated magnesium carbenoids. The intermediate of this reaction was proved to be a cyclopropylmagnesium
衍生自酮的1-氯乙烯基对甲苯基亚砜和氯甲基对甲苯基亚砜与氰基甲基锂的加成反应以定量收率得到加合物。用i- PrMgCl在THF中处理加合物导致生成的镁类类胡萝卜素通过分子内烷基化形成氰基环丙烷。证明该反应的中间体是环丙基氯化镁,并且发现它与亲电试剂反应,得到多取代的氰基环丙烷。关键反应,类胡萝卜素镁的分子内烷基化,是镁类胡萝卜素与腈稳定化碳负离子反应的第一个例子。