在由二乙基锌和L-(+)-酒石酸二烷基酯制备的手性锌络合物的存在下,进行1,2-(N-酰基亚氨基)环己烷(N-酰基环丙啶)与一些硫醇的不对称开环反应,得到反式2-(N-酰基氨基)-1-芳基硫代环己烷的ee最高可达93%。对映选择性很大程度上受反应物的摩尔比和手性酒石酸二烷基酯的性质的影响。L-(+)-酒石酸锌-二烷基络合物的化学结构通过1 H NMR光谱和分子量进行了讨论。
Candida antartica B (immobilized CAL-B) mediated resolutions of trans-2-(phenylthio)cyclohexanol derivatives using vinyl acetate as acylating agent and MTBE as solvent provide excellent enantioselectivity (up to >99%) and high yield of both the enantiomers in short reaction time. (C) 2013 Elsevier B.V. All rights reserved.
Biodegradable choline hydroxide promoted environmentally benign thiolysis of epoxides
作者:Najmedin Azizi、Mahtab Edrisi
DOI:10.1016/j.tetlet.2015.12.080
日期:2016.2
An environmentally benign and rapid thiolysis of epoxides using a biodegradable, choline-based task specific ionic liquid has been developed. The ring opening reaction of aryl and alkyl epoxides proceeded rapidly and afforded the corresponding beta-hydroxysulfides in high yields with excellent regioselectivity. The protocol has the advantages of easy work-up, short reaction times, high yields, and a biodegradable catalyst. (C) 2015 Elsevier Ltd. All rights reserved.