Preparation of (2R,3S)-(−)- and (2S,3R)-(+)-2,3-epoxy-2-methylbutanoic acids and some of their esters
作者:J Martín Torres-Valencia、Carlos M Cerda-García-Rojas、Pedro Joseph-Nathan
DOI:10.1016/0957-4166(95)00205-4
日期:1995.7
Enantiomerically pure (2R,3S)-(−)- and (2S,3R)-(+)-2,3-epoxy-2-methylbutanoic acids 7 and 8 were prepared from 2-methyl-2-butenoic acid 1 (tiglic acid). They were characterized by spectroscopic and optical activity data and their absolute configuration was determined by chemical correlation with (R)-(+)- and (S)-(−)-2-methyl-1,2-butanediols. The corresponding methyl (16 and 17), menthyl (3 and 4),
由2-甲基-2-丁烯酸制备对映体纯的(2 R,3 S)-(-)-和(2 S,3 R)-(+)-2,3-环氧-2-甲基丁酸7和8。酸1(tiglic酸)。通过光谱和光学活性数据对其进行了表征,并通过与(R)-(+)-和(S)-(-)-2-甲基-1,2-丁二醇的化学相关性确定了它们的绝对构型。相应的甲基(16和17),薄荷基(3和4)和9α-Angylyloxy-1-oxolongipin-2-en-7β-yl(14和还制备了15)酯。