Evaluating polymer-supported isothiourea catalysis in industrially-preferable solvents for the acylative kinetic resolution of secondary and tertiary heterocyclic alcohols in batch and flow
作者:Nitul Ranjan Guha、Rifahath M. Neyyappadath、Mark D. Greenhalgh、Ross Chisholm、Samuel M. Smith、Megan L. McEvoy、Claire M. Young、Carles Rodríguez-Escrich、Miquel A. Pericàs、Georg Hähner、Andrew D. Smith
DOI:10.1039/c8gc02020e
日期:——
acylative kinetic resolution of secondary and tertiary heterocyclic alcohols. In batch, the use of industrially-preferable solvents was investigated, with dimethyl carbonate proving to be most generally-applicable. Significantly, the HyperBTM-derived immobilised catalysts were readily recycled, with no loss in either activity or selectivity. In addition to the kinetic resolution of secondary benzylic, propargylic
已经合成了基于均相异硫脲HyperBTM和BTM的聚合物负载的路易斯碱催化剂,并将其用于仲和叔杂环醇的酰基动力学拆分。分批地,研究了工业上优选的溶剂的使用,其中碳酸二甲酯被证明是最普遍适用的。重要的是,HyperBTM衍生的固定化催化剂易于回收利用,而活性或选择性均没有损失。除了动力学拆分二级苄基,炔丙基,烯丙基和环烷醇衍生物外,还基于优选的3-羟基羟吲哚和3-羟基吡咯烷酮亚结构对22种叔杂环醇进行了分离,分离度高达出色的(s= 7–190)。最后,将固定化的异硫脲催化剂应用于填充床反应器中,以证明连续流动过程中叔杂环醇动力学拆分的第一个实例。3-hydroxyoxindole衍生物在乙酸乙酯(分辨率获得高选择性š高达70); 和3- hydroxypyrrolidinones衍生物在甲苯(š高达42)。