Epoxidation of 4-Alkylidenecyclopentenones: A Route to the 1-Oxaspiro[2.4]hept-6-en-5-one Framework
作者:Mohammed Ahmar、Stéphane Thomé、Bernard Cazes
DOI:10.1002/ejoc.201201030
日期:2012.12
Thanks to their lack of polarity, the exocyclic double bonds of 4-alkylidenecyclopentenones 4 are selectively epoxidized by MCPBA to give spiroepoxycyclopentenones 7, which feature the nonclassical 1-oxaspiro[2.4]hept-6-en-5-one framework. Under acidic conditions, compounds 7 undergo ring-opening to afford 4-hydroxy-4-(1-hydroxyalkyl)cyclopentenones 10.
由于缺乏极性,4-亚烷基环戊烯酮 4 的环外双键被 MCPBA 选择性环氧化得到螺环环氧环戊烯酮 7,其具有非经典的 1-oxaspiro[2.4]hept-6-en-5-one 骨架。在酸性条件下,化合物 7 开环得到 4-羟基-4-(1-羟基烷基)环戊烯酮 10。