Resolution of Homoallylic Alcohols Containing Dithioketene Acetal Functionalities. Synthesis of Optically Active .gamma.-Lactones by a Combination of Chemical and Enzymic Methods
摘要:
Racemic homoallylic alcohols 1-3 containing dithioketeneacetal functionalities were prepared by addition of aldehydes to the allylic anions of ketene dithioacetals or 2-alkenyl-1,3-dithiane in a regio- and stereoselective manner. Lipase-catalyzed hydrolyses of the corresponding acetates 7-9 afforded optically active alcohols 1-3, which were treated with mercuric chloride to give gamma-lactones such as natural hop lactone, whiskey lactone, and cognac lactone.
Dichotomous regiochemistry of aldehyde and ketone in the reaction with dithio-substituted crotyllithium
作者:Jim Min Fang、Bor Cherng Hong、Li Fan Liao
DOI:10.1021/jo00381a026
日期:1987.3
Pai Yuan-Chi, Fang Jim-Min, Wu Shih-Hsiung, J. Org. Chem, 59 (1994) N 20, S 6018-6025
作者:Pai Yuan-Chi, Fang Jim-Min, Wu Shih-Hsiung
DOI:——
日期:——
Resolution of Homoallylic Alcohols Containing Dithioketene Acetal Functionalities. Synthesis of Optically Active .gamma.-Lactones by a Combination of Chemical and Enzymic Methods
作者:Yuan-Chi Pai、Jim-Min Fang、Shih-Hsiung Wu
DOI:10.1021/jo00099a036
日期:1994.10
Racemic homoallylic alcohols 1-3 containing dithioketeneacetal functionalities were prepared by addition of aldehydes to the allylic anions of ketene dithioacetals or 2-alkenyl-1,3-dithiane in a regio- and stereoselective manner. Lipase-catalyzed hydrolyses of the corresponding acetates 7-9 afforded optically active alcohols 1-3, which were treated with mercuric chloride to give gamma-lactones such as natural hop lactone, whiskey lactone, and cognac lactone.