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 angular methyl groups 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 methyl groups.
已经开发了一种有效的方法来合成具有与环氧相邻的角甲基的反式稠合的四氢吡喃。该过程涉及磺酰稳定环氧乙烷基阴离子与适当的三氟甲磺酸酯,接着6-偶联反应内的环化,并且有效的结构6 / 6-和与空间位阻的1 6/7/6环醚的环系统,3-二轴甲基。