Catalytic Asymmetric Synthesis of Both <i>syn</i>- and <i>anti</i>-3,5-Dihydroxy Esters: Application to 1,3-Polyol/α-Pyrone Natural Product Synthesis
作者:Shin-ya Tosaki、Tetsuhiro Nemoto、Takashi Ohshima、Masakatsu Shibasaki
DOI:10.1021/ol0273708
日期:2003.2.1
[reaction: see text] We describe a catalytic asymmetric synthesis of both syn- and anti-3,5-dihydroxy esters. The method relies upon catalytic asymmetric epoxidation of alpha,beta-unsaturated imidazolides and amides, using lanthanide-BINOL complexes, and diastereoselective reduction of ketones. The method was applied to the enantioselective syntheses of 1,3-polyol/alpha-pyrone natural products 9a,
[反应:见正文]我们描述了顺式和反式3,5-二羟基酯的催化不对称合成。该方法依赖于使用镧系元素-BINOL配合物的α,β-不饱和咪唑化物和酰胺的催化不对称环氧化和酮的非对映选择性还原。该方法用于1,3-多元醇/α-吡喃酮天然产物9a,9b和严格的氟利农酮(10)的对映选择性合成。还确定了9a和9b的绝对立体化学。