Stereoselective reduction of β hydroxyketones to 1,3-diols highly selective 1,3-asymmetric induction via boron chelates
作者:Koichi Narasaka、Fong-Chang Pai
DOI:10.1016/0040-4020(84)80006-x
日期:1984.1
Highly selective asymmetric induction can be achieved in the reduction of acyclic β-hydroxyketones via boron chelates. Treatment of β-hydroxyketones (1) with tributyl or tri-isobutylborane and successively with sodium borohydride afforded syn-1,3-diols (3) in highly stereo-selective manner, Syn -α-substituted-β -hydroxyketones (8) were also reduced to give syn, syn-1,3-diols (9) exclusively. The reaction
通过硼螯合物还原无环β-羟基酮可以实现高度选择性的不对称诱导。β羟基酮的治疗(1)用三丁基-或三- isobutylborane和依次用硼氢化钠,得到顺式-1,3-二醇(3在高度立体选择性的方式),Syn的-α取代-β-hydroxyketones(8)为也还原为仅生成syn,syn -1,3-二醇(9)。该反应进一步用于方便地制备3-脱氧己糖。