Candida antarctica lipase B catalysed kinetic resolution of 1,2,3,4-tetrahydro-ß-carbolines: Substrate specificity
作者:Barbara Kovács、Enikő Forró、Ferenc Fülöp
DOI:10.1016/j.tet.2018.10.034
日期:2018.11
In the frame of substrate specificity, CAL-B-catalysed asymmetric N-alkoxycarbonylations of 1-substituted tetrahydro-ß-carbolines (Me, Et, Pr, iPr) have been studied. High enantioselectivities (>200) were observed, when alkoxycarbonylation of racemic compounds (±)-1,3,5,7 were performed in DIPE in the presence of phenyl allyl carbonate and Et3N at 60 °C using ultrasound shaking method. The reaction
在底物特异性的框架内,已研究了CAL-B催化的1-取代的四氢-ß-咔啉(Me,Et,Pr,iPr)的不对称N-烷氧基羰基化。当在60℃下使用超声摇动法在碳酸苯丙酯和Et 3 N存在下,在DIPE中进行外消旋化合物的烷氧基羰基化(±)-1,3,5,7时,观察到高对映选择性(> 200)。反应时间随着C1上取代基尺寸的增加而显着增加。然而,事实证明,异丙基取代的化合物对于CAL-B的最佳活性而言过大。使用Pd 2(dba)3 .CHCl 3水解(R)-氨基甲酸酯对映异构体。得到游离胺的对映体,其ee值极好(> 99%)。