Synthesis of optically active gem-difluorocyclopropanes through a chemo-enzymatic reaction strategy
作者:Toshiyuki Itoh、Nanae Ishida、Koichi Mitsukura、Shuichi Hayase、Kazumasa Ohashi
DOI:10.1016/j.jfluchem.2004.01.010
日期:2004.5
has been accomplished using lipase-catalyzed reaction; the prochiral diacetate of cis-1,3-bishydroxymethyl-2,2-difluorocyclopropane was converted to the corresponding chiral monoacetate by the Alcaligenes lipase (lipase QL)-catalyzed hydrolysis with >99% enantiomeric excess. Enantiomerically pure trans-1,3-bishydroxymethyl-2,2-difluorocyclopropane was also obtained through the Pseudomonas cepacia SL-25
手性二氟环丙烷结构单元的合成已通过脂肪酶催化的反应完成。顺式-1,3-双羟甲基-2,2-二氟环丙烷的前手性二乙酸酯通过Alcaligenes脂肪酶(脂肪酶QL)催化水解而转化为相应的手性单乙酸酯,对映体过量> 99%。对映体纯的反式-1,3-双羟甲基-2,2-二氟环丙烷也可以通过假单胞菌SL-25脂肪酶(脂肪酶SL)催化反应获得。使用相同的脂肪酶技术已经完成了手性反式,反式-双-双-宝石-二氟环丙烷衍生物的合成。反式,使用脂肪酶SL催化的相应二乙酸酯的水解,以光学活性形式获得反式-1,6-双羟甲基-2,2,5,5-四氟双环丙烷。