A series of natural product 23-hydroxybetulinic acid derivatives were prepared. In the preparation of mono-O-benzoyl ester derivative, it was observed that benzoyl group migrated from 3-0- to 23-O-position during the ...A series of natural product 23-hydroxybetulinic acid derivatives were prepared. In the preparation of mono-O-benzoyl ester derivative, it was observed that benzoyl group migrated from 3-0- to 23-O-position during the detritylation.展开更多
基金supported by the National Natural Science Foundation of the People's Republic of China(No.30472083).
文摘A series of natural product 23-hydroxybetulinic acid derivatives were prepared. In the preparation of mono-O-benzoyl ester derivative, it was observed that benzoyl group migrated from 3-0- to 23-O-position during the detritylation.