A Highly Diastereoselective TiCl4-Mediated Reduction of β-Hydroxy Ketones with BH3·py — A Very Efficient and General Synthesis of syn-1,3-Diols
作者:Giuseppe Bartoli、Marcella Bosco、Enrico Marcantoni、Massimo Massaccesi、Samuele Rinaldi、Letizia Sambri
DOI:10.1002/1099-0690(200112)2001:24<4679::aid-ejoc4679>3.0.co;2-o
日期:2001.12
β-Hydroxy ketones can be reduced to the corresponding 1,3-diols in high yields and with excellent diastereoselectivity by carrying out the reaction with BH3·pyridine in CH2Cl2 at −78 °C in the presence of TiCl4. This protocol is general and chemoselective: excellent results are obtained when the substituents are primary, secondary, tertiary alkyl chains or aromatic moieties. The presence of reducible
β-羟基酮可以通过在-78 °C 和 TiCl4 存在下与 BH3·吡啶在 CH2Cl2 中进行反应,以高产率和优异的非对映选择性还原为相应的 1,3-二醇。该方案是通用的且具有化学选择性:当取代基为伯、仲、叔烷基链或芳族部分时,可获得优异的结果。可以很好地容忍可还原的官能团如溴、硝基和氰基的存在。