Kinetic Resolution of 1-Biaryl- and 1-(Pyridylphenyl)alkan-1-ols Catalysed by the Lipase B from<i>Candida antarctica</i>
作者:Robert Kourist、Javier González-Sabín、Ramón Liz、Francisca Rebolledo
DOI:10.1002/adsc.200404330
日期:2005.4
enantioselective (E>200) transesterification of some 1-biaryl-2-yl-, -3-yl-, and -4-ylethanols and -propan-1-ols, as well as 1-(o-, m-, and p-pyridylphenyl)ethanols, 6, with vinyl acetate, Kazlauskas' rule being obeyed in all cases. meta and para-Substituted substrates were transformed within several hours (conversion degree ranging from 23–50%), reaction rates for propan-1-ol derivatives being slower than
南极假丝酵母的脂肪酶B (CAL-B)催化一些1-联芳基-2-基-,-3-基和-4-基乙醇和-丙-1-醇的高度对映选择性(E > 200)酯交换,以及1-(o-,m-和对-吡啶基苯基)乙醇6含乙酸乙烯酯,在所有情况下均应遵守Kazlauskas规则。间位和对位取代的底物在数小时内转化(转化率范围为23-50%),丙-1-醇衍生物的反应速率比乙醇衍生物的反应速率慢。邻位酯交换-取代的醇用了几天,并伴有化学酶促副反应:形成了另一种由半缩醛衍生的乙酸酯,其在6和乙醛之间是由乙酸乙烯酯形成的。在乙酸异丙烯酯作为酰基供体的情况下,该副反应被抑制,酯交换反应的转化度在十天后为20-40%(E > 200)。还证明了(R)-6p作为配体在将二乙基锌不对称加成到苯甲醛中的有用性。