Synthesis of small ring-containing conjugated dienes via the coupling reaction of cyclopropyl- and cyclobutylmagnesium carbenoids with α-sulfonylallyllithiums
作者:Tsutomu Kimura、Mio Inumaru、Takuma Migimatsu、Masashi Ishigaki、Tsuyoshi Satoh
DOI:10.1016/j.tet.2013.03.019
日期:2013.5
synthesized via the coupling reaction of cyclopropyl- and cyclobutylmagnesium carbenoids with α-sulfonylallyllithiums. Small ring cycloalkylmagnesium carbenoids were generated from aryl 1-chlorocycloalkyl sulfoxides and a Grignard reagent, and the resultant magnesium carbenoids were reacted with α-sulfonylallyllithiums, which were prepared via the deprotonation of p-tolyl vinyl sulfones or allyl p-tolyl
通过环丙基和环丁基镁类胡萝卜素与α-磺酰基烯丙基锂的偶联反应,合成了各种烯丙基环丙烷和烯丙基环丁烷。由芳基1-氯环烷基亚砜和格利雅试剂生成小环环烷基镁类胡萝卜素,然后使生成的镁类胡萝卜素与α-磺酰基烯丙基锂反应,后者是通过对甲苯基乙烯基砜或烯丙基p的去质子化反应制得的。-甲苯基砜。亚芳基环烷烃的收率中等至良好,而亚芳基环烷烃与四氰基乙烯的Diels-Alder反应提供了螺环化合物。无环烷基镁类胡萝卜素与α-磺酰基烯丙基锂的偶联反应提供了作为几何异构体混合物的共轭二烯。DFT计算的结果表明,相对于相应的氯环烷烃,小环环烷基镁类胡萝卜素具有较长的C–Cl键,并且C–Cl键的背面具有扩展的键角。