A novel boron trifluoride etherate mediated deep-seated rearrangement of an α,β-epoxyketone
作者:Adusumilli Srikrishna、Sripada S.V. Ramasastry
DOI:10.1016/j.tetasy.2005.07.030
日期:2005.9
of carvone epoxide 2 resulted in dimeric products 3 and 4, in contrast to the expected ring contraction product. Reaction of β-methylcarvone epoxides 8 and 11 with acids furnished 2-acetyl-4-isopropenylcyclopentanones 9 and 14 containing a stereodefined quaternary carbon atom. On the other hand, the reaction of epoxides 8 and 11 with boron trifluoride etherate lacks the stereoselectivity and in addition
与预期的环收缩产物相反,香芹酮环氧化物2的酸催化反应产生二聚产物3和4。β-甲基香芹酮环氧化物8和11与酸的反应提供了含有立体定义的季碳原子的2-乙酰基-4-异丙烯基环戊烷酮9和14。在另一方面,环氧化物的反应8和11用三氟化硼醚缺乏立体选择性,此外,抗-epoxide 8布置内酯18经由一个不寻常的深层次重排。