A new entry to carbocycles: synthesis of cyclopentene and cyclohexene derivatives through endo-mode ring closure of allenyl sulfones
作者:Chisato Mukai、Rie Ukon、Norikazu Kuroda
DOI:10.1016/s0040-4039(03)00067-4
日期:2003.2
Treatment of dimethyl 4-(phenylsulfonyl)-4,5-hexadiene-1,1-dicarboxylate with potassium tert-butoxide in tert-butanol at room temperature effected successive endo-mode ring closure at the sp-hybridized carbon center and demethoxycarbonylation of the resulting malonate derivative leading to the exclusive formation of methyl 2-methyl-3-(phenylsulfonyl)-1-cyclopentenecarboxylate. An additional seven allenyl
在室温下用叔丁醇叔丁醇钾在叔丁醇中处理4-(苯磺酰基)-4,5-己二烯-1,1-二羧酸二甲酯,在sp杂化碳中心连续进行内模闭环反应,并进行脱甲氧基羰基化反应。生成的丙二酸酯衍生物导致仅形成2-甲基-3-(苯基磺酰基)-1-环戊烯甲酸甲酯。另外的具有1,3-二羰基官能度的七烯丙基砜以高收率得到相应的环戊烯或环己烯衍生物。