An efficient strategy for the iterative synthesis of a trans-fused polytetrahydropyran ring system via SmI2-induced reductive intramolecular cyclization
A highly efficient strategy for the iterative synthesis of a trans-fused polytetrahydropyran ringsystem was developed. The new iterative method involves SmI2-induced reductive intramolecular cyclization of an aldehyde and a β-alkoxy acrylate as the key step, producing a 2,3-trans-tetrahydropyran ring.
A Convergent Strategy for the Synthesis of Polycyclic Ethers by Using Oxiranyl Anions
作者:Takeo Sakai、Ai Sugimoto、Yuji Mori
DOI:10.1021/ol202467z
日期:2011.11.4
A new [X+2+Y]-type for the convergent synthesis of polycyclic ethers based on an oxiranyl anion strategy was developed. The sequence involves nucleophilic substitution of a triflate with an oxiranyl anion followed by 6-endo cyclization, ringexpansion, and reductive etherification. The protocol features a flexible approach toward trans-fused polycyclic arrays consisting of six- and seven-membered ether