Design, synthesis and structure of new chiral squaric acid monoaminoalcohols and diaminoalcohols and their use as catalysts in asymmetric reduction of ketones and diketones
作者:Hai-Bing Zhou、Ji Zhang、Shou-Mao Lü、Ru-Gang Xie、Zhong-Yuan Zhou、Michael C.K Choi、Albert S.C Chan、Teng-Kuei Yang
DOI:10.1016/s0040-4020(01)00936-x
日期:2001.11
Many chiral squaric acid aminoalcohols and C2-symmetric diaminoalcohols have been synthesized and their in situ formed chiral boron heterocycles have been used as catalysts for the enantioselective reduction of prochiral ketones and diketones by borane to give alcohols with up to 99% enantiomeric excess and 99% yield. The effects of solvent, catalyst–substrate ratio and temperature were also investigated
已经合成了许多手性方酸氨基醇和C 2对称的二氨基醇,它们的原位形成的手性硼杂环已被用作催化剂,通过硼烷对手性酮和二酮进行对映选择性还原,制得对映体过量高达99%的醇和99 % 屈服。还研究了溶剂,催化剂-底物比例和温度的影响。