摘要:
                                2-Methylenetetrahydropyran-3-ol derivative, a key segment for convergent synthesis of polycyclic ethers based on Suzuki-Miyaura coupling, was efficiently synthesized by two methods; (1) via SmI2-induced reductive cyclization of beta-alkoxyvinyl sulfone with aldehyde followed by elimination of the sulforyl group, and (2) via SmI2-induced cyclization of beta-alkoxyvinyl sulfoxide with aldehyde followed by dehydration of the 2-hydroxymethyl group.