作者:David W. Jones、Adrian M. Thompson
DOI:10.1039/c39870001797
日期:——
The 2-benzopyran-3-one (7) is a stable, isolable, and useful Diels–Alder diene; its adduct (10) formed with dimethyl fumarate is transformed in three steps into methyl epipodophyllate (14) which gives epipodophyllotoxin (2)(81%) by direct lactonisation (ZnCl2–tetrahydrofuran–4 Å molecular sieves).
2-苯并吡喃-3-酮(7)是稳定,可分离且有用的Diels–Alder二烯;由富马酸二甲酯形成的加合物(10)经三步转化为表鬼臼酸甲酯(14),通过直接内酯化作用(ZnCl 2 –四氢呋喃–4Å分子筛)得到表鬼臼毒素(2)(81%)。