Syntheses of the insect antifeedant (.+-.)-cinnamodial and the drimane sesquiterpenoids (.+-.)-isodrimenin and (.+-.)-fragrolide
作者:James D. White、Lester P. J. Burton
DOI:10.1021/jo00203a014
日期:1985.2
Total Synthesis of Euryfuran via Two Sequential Furan Ring Transfer Reaction
作者:Ken Kanematsu、Seizo Soejima
DOI:10.3987/com-91-5794
日期:——
Total synthesis of the marine natural product euryfuran (4) via two sequential furan ring transfer reaction is presented. Key elements of the reaction pathway include as follows; 1) the preparation of propargyl ethers (5c), (10b), and (17c), and its transformation to allylic alcohols (6), (11) and (18), 2) introduction of the angular alkyl group via [3,3] sigmatropic rearrangement.
Alternative synthetic approaches to (±)-euryfuran via the furan ring transfer reaction
effective synthetic approaches to (±)-euryfuran 1 are described. One synthetic route makes use of sequential furanringtransferreaction type I and type III as key steps followed by Eschenmoser-type [3,3]sigmatropic rearrangement, and another route proceeded through furanringtransferreaction type I and annulation with ethyl vinyl ketone subsequently.