The Candida antarctica lipase B-catalyzed reactions of five β-amino esters with neat butyl butanoate and with 2,2,2-trifluoroethyl butanoate in diisopropyl ether were studied, as were the reactions of the same β-amino esters and their N-butanamides with neat butanol. The possibility for sequential resolution, where the amino and ester functions of the substrate both react with an achiral butanoate, became less likely with increasing size of the substrate from ethyl 3-aminobutanoate (1a) to pentanoate (1b) or larger. On the other hand, the alcoholyses of N-acylated β-amino esters successfully proceeded in butanol with E > 100. Gram-scale resolution of the N-butanoylated 1a was performed to demonstrate the usefulness of the method. Key words: lipase, interesterification, acylation, alcoholysis, resolution, β-amino esters.
用Candida antarctica脂肪酶B催化的五种β-氨基酯与纯正丁基丁酸酯以及二异丙基醚中2,2,2-三氟乙基丁酸酯的反应进行了研究,同时还研究了相同β-氨基酯及其N-丁酰胺与纯正丁醇的反应。随着底物从乙基3-氨基丁酸酯(1a)增大到戊酸酯(1b)或更大,底物的氨基和酯基与不对称丁酸酯同时反应的连续分辨可能性逐渐降低。另一方面,N-酰化的β-氨基酯在丁醇中成功进行了醇解,E > 100。进行了N-丁酰化1a的克级分辨,以展示该方法的实用性。关键词:脂肪酶,酯交换,酰化,醇解,分辨,β-氨基酯。