Enantioselective Reduction of Prochiral Ketones Using a Reagent Prepared from Lithium Aluminium Hydride, (+)<i>Threo</i>-1,16-Dibenzyloxy, 7(R),8(R)-Dihydroxy Hexadecane and Alcohol
作者:N. B. Malkar、V. G. Kumar
DOI:10.1080/00397919808004480
日期:1998.12
Abstract Asymmetric reduction of prochiral ketones to optically active chiral secondary alcohols was achieved using a reagent prepared by modifying lithium aluminium hydride with a chiral auxiliary, (+)threo-1,16-dibenzyloxy,7,8-dihydroxy hexadecane and various additive alcohols. (+)threo-1,16-dibenzyloxy,7(R),8(R)-dihydroxy hexadecane was prepared from (+)threo-9(R),10(R),16-trihydroxy hexadecanoic
摘要 使用通过用手性助剂、(+)threo-1,16-二苄氧基、7,8-二羟基十六烷和各种添加剂醇改性氢化铝锂制备的试剂,实现了前手性酮向旋光手性仲醇的不对称还原。(+)threo-1,16-dibenzyloxy,7(R),8(R)-二羟基十六烷由(+)threo-9(R),10(R),16-三羟基十六烷酸制备。使用了不同链长 (n = 0–11) 的 CH3(CH2)n-OH 和 (R)-hydnocarpic 醇等醇类。由 (+)threo-1,16-二苄氧基、7(R)、8(R)-二羟基十六烷、LAH 和 (R)-hydnocarpic 醇制备的复合物以中等对映选择性(最大 70% ee)还原苯乙酮。各种芳烷基酮用相同的络合物还原。