Diastereoselectivity in the Reduction of Acyclic Carbonyl Compounds with Diisopropoxytitanium(III) Tetrahydroborate
作者:K. S. Ravikumar、Surajit Sinha、S. Chandrasekaran
DOI:10.1021/jo9902906
日期:1999.8.1
Diisopropoxytitanium(III) tetrahydroborate, ((PrO)-Pr-i)(2)TiBH4, formed in situ in dichloromethane from diisopropoxytitanium dichloride and benzyltriethylammonium tetrahydroborate (1:2) reduces alpha-hydroxyketones/1,2-diketones and beta-hydroxyketones/1,3-diketones to the corresponding diols with high stereoselectivity. In the case of alpha-hydroxyketones and 1,2-diketones, the anti isomer is the major product while reduction of beta-hydroxyketones and 1,3-diketones leads to the syn isomer as the major product.