Asymmetric Ï-allylic substitution of meso-1,4-diacetoxycyclopentene and meso-1,4-diacetoxycyclohexene with various nucleophiles was performed with an amphiphilic polystyrene-poly(ethylene glycol) (PS-PEG) resin-supported chiral imidazoindolephosphine-palladium complex in water as a single reaction medium under heterogeneous conditions to give the corresponding 1-acetoxy-4-substituted cycloalkenes with up to 99% ee.
在
水相单一反应介质下,使用支持亲
水性的聚
苯乙烯-聚
乙烯醇(PS-P
EG)
树脂的手性
咪唑吲哚磷酸钯络合物,以非对称π-烯丙基取代反应对meso-1,4-二
醋酸氧基
环戊烯和meso-1,4-二
醋酸氧基
环己烯进行操作,采用各种亲核试剂,以异构体优率高达99%的相应1-
醋酸氧基-4-取代环烯烃作为产物。