A Novel Strategy for the Convergent Synthesis of 1,3,5,…-Polyols: Enone Formation, Asymmetric Dihydroxylation, Reductive Cleavage, Hydride Addition
作者:Reinhard Brückner、Karsten Körber、Philippe Risch
DOI:10.1055/s-2005-921915
日期:——
Asymmetric dihydroxylation of α,β-unsaturated ketones provided α,β-dihydroxyketones with up to 100% ee. The Cα-O bond of these intermediates or their bis-TMS ethers, acetonides, phenylborates or orthoformiates was cleaved with SmI2, affording β-hydroxyketones. The latter can be reduced to furnish syn- or anti-configured 1,3-diols of any desired configuration.
α,β-不饱和酮的不对称二羟基化提供了高达 100% ee 的 α,β-二羟基酮。这些中间体或其双TMS 醚、丙酮化合物、苯硼酸盐或原甲酸盐的Cα-O 键被SmI2 裂解,得到β-羟基酮。后者可被还原以提供任何所需构型的顺式或反式1,3-二醇。