作者:George O’Doherty、Mingde Shan
DOI:10.1055/s-2008-1067262
日期:2008.10
syntheses of three cyclitols, 5a-carba-α-D-rhamnopyranose, 5a-carba-β-D-digitoxopyranose, and 5a-carba-α-L-rhamnopyranose, have been achieved. The routes rely upon a Simmons-Smith cyclopropanation and diastereospecific ring opening of cyclopropanol under Pd/C hydrogenation conditions to prepare the α-methyl ketone. A sequence of diastereoselective reduction, dihydroxylation, and/or Myers' reductive 1,3-rearrangement
已经实现了三种环醇的立体选择性合成,即 5a-carba-α-D-rhamnopyranose、5a-carba-β-D-digitoxopyranose 和 5a-carba-α-L-rhamnopyranose。该路线依赖于 Simmons-Smith 环丙烷化和环丙醇在 Pd/C 氢化条件下的非对映选择性开环来制备 α-甲基酮。使用一系列非对映选择性还原、二羟基化和/或 Myers 还原 1,3-重排来安装所需的立体化学。