A [2++4] polar cycloaddition of α-chlorosulfides with conjugated dienes: one-pot synthesis of 1-acyl- and 1-cyano-1-methylthio-2-vinylcyclopropanes
作者:H. Ishibashi、Y. Kitano、H. Nakatani、M. Okada、M. Ikeda、M. Okura、Y. Tamura
DOI:10.1016/s0040-4039(01)81403-9
日期:1984.1
In the presence of SnCl4, methoxycarbonyl-, acetyl-, benzoyl-, or cyano-substituted chloromethyl methyl sulfide (1–4) undergoes [2++4] polar cycloaddition with conjugated dienes to afford the cycloadducts of type 7, which, on treatment with base, are converted into the 1-acyl- or 1-cyano-1-methylthio-2-vinylcyclopropanes 9–10 via the ylide intermediates of type 8.
在SnCl 4存在下,甲氧基羰基,乙酰基,苯甲酰基或氰基取代的氯甲基甲基硫醚(1-4)与共轭二烯进行[2 + +4]极性环加成反应,得到7型环加合物。经碱处理后,通过类型8的叶立德中间体转化为1-酰基或1-氰基-1-甲硫基-2-乙烯基环丙烷9-10 。