Adducts of alkyl(phenylthio)ketenes to cyclopentadiene are cleaved with KOH-t-BuOK with retention of configuration at three centers. This observation broadens the synthetic potential of the method of vicinalalkylation of olefins. This method has been used for the vicinal addition of [Cm + Cn] units to cyclopentadiene.
用KOH-t-BuOK裂解烷基(苯硫基)乙烯酮与环戊二烯的加合物,并保留三个中心的构型。该发现拓宽了烯烃的邻烷基化方法的合成潜力。该方法已用于[C m + C n ]单元的邻位加成到环戊二烯中。
DE2023732
申请人:——
公开号:——
公开(公告)日:——
MISNEL R.; ODONNELL M.; BINAME R.; HESBAIN-FRISQUE A. M.; GNOSEZ L.; DESL+, TETRAHEDRON LETT., 1980, 21, NO 26, 2577-2580
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