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