epoxide bridge in N-substituted 2,3,7,7a-tetrahydro-3a,6-epoxyisoindol-1-ones by the action of BF3⋅Et2O in acetic anhydride at 25°C over 1 h proceeds through an SN1 mechanism. The allylic type cation formed in the first step is stabilized by the addition of an acetoxy group at C-5 in the isoindole system to give a mixture of cis and trans isomers of 5,6-diacetoxy-2,3,5,6,7,7a-hexa-hydroisoindol-1-ones, which
在25°C下于1小时内通过BF 3· Et 2 O在
乙酸酐中的作用进行N-取代的2,3,7,7a-四氢-3a,6-环氧异
吲哚-1-酮中的环氧基桥的反应通过S N 1机制。在第一步中形成的烯丙基型阳离子可通过在异
吲哚体系中的C-5处添加乙酰氧基来稳定,得到5,6-
二乙酰氧基-2,3,5,6的顺式和反式异构体的混合物,将7,7a-六氢异
吲哚-1-酮在这些条件下经24小时芳构化,得到2,3-二氢-
1H-异吲哚-1-酮。