A convenient synthesis of 4-phenylchalcogeno allenic esters from α-(phenylchalcogeno)acid chlorides
作者:Claudio C Silveira、Paula Boeck、Antonio L Braga
DOI:10.1016/s0040-4039(00)00067-8
日期:2000.3
The reaction of ethyl 2-(triphenylphosphoranylidene) acetate or propionate 3a–b with α-chalcogeno ketenes generated in situ by the reaction of α-chalcogeno acidchlorides 1–2 with triethylamine in dichloromethane gives moderate to good yields of 4-phenylchalcogeno allenic esters 4. The corresponding 4-phenylseleno allenic esters 4a–e were obtained in isolated yields of 60 to 93%, while 4-phenylthio