Building Blocks for the Stereocontrolled Synthesis of 1,3-Diols of Various Configurations
作者:Stefan Weigand、Reinhard Brückner
DOI:10.1055/s-1997-732
日期:1997.2
to the epoxyalcohol 15 which was converted into the acetonide alcohols 21 and 23, building blocks for enantiopure anti-1,3-diols. Alternatively, the same epoxyketone 14 and cp2Ti(III)Cl / 1,4-cyclohexadiene gave the β-hydroxyketone 16. This compound was transformed into the acetonide alcohols 22 and 24, building blocks for enantiopure syn-1,3-diols.
戊二烯醇 12 的 Sharpless 环氧化得到 97.7% ee 的不饱和环氧醇 11。11 的甲硅烷基化和臭氧分解提供了环氧酮 14。14 的完全反选择性还原与 Zn(BH4)2 一起成功。它导致环氧醇 15 转化为丙酮醇 21 和 23,它们是对映体纯抗 1,3-二醇的构建单元。或者,相同的环氧酮 14 和 cp2Ti(III)Cl/1,4-环己二烯得到 β-羟基酮 16。该化合物转化为丙酮醇 22 和 24,它们是对映纯的合成 1,3-二醇的构建单元。