Synthesis of trans-fused polycyclic ethers with angular methyl groups using sulfonyl-stabilized oxiranyl anions
作者:Hiroki Furuta、Toyohisa Takase、Hisafumi Hayashi、Ryoji Noyori、Yuji Mori
DOI:10.1016/j.tet.2003.09.016
日期:2003.12
developed for the synthesis of trans-fused tetrahydropyrans with angularmethylgroups adjacent to the ring oxygen. The procedure involves the coupling reaction of a sulfonyl-stabilized oxiranyl anion with an appropriate triflate followed by 6-endo cyclization, and is effective for the construction of 6/6- and 6/7/6-cyclic ether ring systems with sterically congested 1,3-diaxial methylgroups.
A stereocontrolled synthesis of methyl-substituted trans-fusedtetrahydropyrans having methyl groups adjacent to the ring oxygen is described. The strategy involves the coupling reaction of sulfonyl-stabilized oxiranylanions with triflates and 6-endocyclization of their products.
A New Strategy for the Reiterative Synthesis of <i>trans</i>-Fused Tetrahydropyrans <i>via</i> Alkylation of Oxiranyl Anion and 6-<i>endo</i> Cyclization