The reaction of (±) methyl 4, 5-trans-epoxy-2E-hexenoate (2) with aromatic nucleophiles having an electrondonating group in the presence of BF3·Et2O gave the 4, 5-anti-5-hydroxy-4- or/and 2, 5-anti-5-hydroxy-2-substituted products. The 5-acetates of the 4, 5-anti-4-substitution products were subjected to enantioselective hydrolysis with lipase to provide the optically acitive 4, 5-disubstituted 2-hexenoate derivatives.
在
BF3·Et2O存在下,(±)甲基4, 5-反式环氧-2E-己烯酸酯(2)与带有供电子基团芳香亲核试剂反应,生成4, 5-反式-5-羟基-4-或/和2, 5-反式-5-羟基-2-取代产物。4, 5-反式-4-取代产物的5-
乙酸酯经
脂肪酶手性
水解,得到光学活性的4, 5-双取代
2-己烯酸酯衍
生物。