Chemo- and Enantioselective Acyl Transfers by Lipases and Acylase I: Preparative Applications in Hydroxymethylpiperidine Chemistry
作者:Katri Lundell、Petka Lehtinen、Liisa T. Kanerva
DOI:10.1002/adsc.200303018
日期:2003.6
and acylase I-catalysed acylation of bifunctional 2- and 3-hydroxymethylpiperidines (1 and 2) and the alcoholysis of the corresponding diacylated counterparts 7 and 8 have been studied. Lipase AK from Pseudomonas fluorescens allowed the preparative-scale resolution of 7 in neat butanol at 50% conversion whereas the 3-regioisomer 8 reacted with negligible enantioselectivity (E=7). The lipase- and acylase I-catalysed
已经研究了脂酶和酰基酶I催化的双官能2-和3-羟甲基哌啶(1和2)的酰化作用以及相应的双酰化对应物7和8的醇解作用。荧光假单胞菌的脂肪酶AK可以在纯丁醇中以50%的转化率制备规模级分离度7,而3-区域异构体8的对映选择性可忽略不计(E = 7)。在有机溶剂中,脂肪酶和酰基转移酶I催化的1和2的酰化反应的对映选择性低。另一方面,1和2的90%以上在TBME中存在南极假丝酵母脂肪酶A的情况下,用2,2,2-三氟乙基丁酸酯以高度化学选择性的O-酰化反应,将其分别转化为氨基酯3和4。所述ø -保护产品3在反应混合物中在哌啶氮是容易获得的另一变换虽然3不分离,由于分子内的ON酰基迁移。在4的情况下,酰基迁移的趋势不那么明显。