作者:Francesca Bellezza、Antonio Cipiciani、Giacomo Ricci、Renzo Ruzziconi
DOI:10.1016/j.tet.2005.06.007
日期:2005.8
The enzymatic hydrolysis of methyl 2-fluoro-2-arylpropionates was performed using lipases from Candida rugosa and Candida cylindracea (OF-360). A careful analysis of the reaction products revealed that racemic 2-hydroxy-2-arylpropionic acid and traces of 2-arylacrylic acid are formed, in addition to the expected 2-aryl-2-fluoropropionic acid. The presence of powerful electron-releasing groups in the
2-氟-2-芳基丙酸甲酯的酶促水解是使用来自皱念珠菌和圆柱形念珠菌(OF-360)的脂肪酶进行的。对反应产物的仔细分析表明,除了预期的2-芳基-2-氟丙酸外,还形成了外消旋的2-羟基-2-芳基丙酸和痕量的2-芳基丙烯酸。在底物的芳环中存在强电子释放基团增加了2-羟基丙酸的量。已建立了一种机制假说,根据该假说,酶促进了水解酸中氟离子的清除,并形成了α-羧基稳定的碳阳离子,该羧基通过H 2的亲核攻击提供了2-羟基丙酸。通过β-消除方法得到O和2-芳基丙烯酸。