Neighboring nucleophilic group assisted rearrangement of allylic esters under Eu(fod)3 catalysis
作者:Wei-Min Dai、Anxin Wu、Mavis Yuk Ha Lee、Kwong Wah Lai
DOI:10.1016/s0040-4039(01)00708-0
日期:2001.6
The acetate 13a and methoxyacetate 13b of (E)-3-hydroxy-4-(arylmethylidene)cyclodeca-1,5-diyne possessing a free hydroxy group underwent an allylic rearrangement at 20°C in the presence of catalytic Eu(fod)3 to give the enediyne 14 in excellent yields. In contrast, the acetate 10a with a silyloxy group failed to rearrange under the same conditions. These results demonstrated that an internal nucleophilic
具有游离羟基的(E)-3-羟基-4-(芳基亚甲基)环癸-1,5-二炔的乙酸盐13a和甲氧基乙酸盐13b在催化Eu(fod)3存在下于20°C进行烯丙基重排从而使烯二炔14的收率极高。相反,具有甲硅烷氧基的乙酸酯10a在相同条件下不能重排。这些结果证明内部亲核基团在温和条件下促进了烯丙基酯的Eu(fod)3催化的重排。