由于需要开发有效的反应,用可持续溶剂(如加压 CO 2 )替代源自化石燃料的普通有机溶剂,因此对 CO 2作为溶剂的适用性的研究变得越来越重要。在我们之前对大体积底物的脂肪酶催化反应的溶剂工程研究中,CO 2膨胀液体(通过溶解加压 CO 2膨胀的液体)中的反应转化率高于没有 CO 2 的液体中的转化率。本研究展示了对 CO 2的详细检查-膨胀液体作为溶剂用于脂肪酶催化的外消旋 1-四氢萘酚、2-四氢萘酚和取代的 1-四氢萘酚类似物的动力学拆分,因为手性取代的四氢萘酚类似物是重要的药物中间体。CO 2膨胀液体在保持优异的对映选择性(E > 200)的同时,将反应速率提高了无 CO 2反应的 40 倍。外消旋 1-四氢萘酚和 2-四氢萘酚的制备规模反应成功地产生了相应的 (R)-乙酸酯和 (S)-醇,具有高产率和优异的对映选择性(高达 ee >99%)。
Identification of an Esterase Isolated Using Metagenomic Technology which Displays an Unusual Substrate Scope and its Characterisation as an Enantioselective Biocatalyst
作者:Declan P. Gavin、Edel J. Murphy、Aoife M. Foley、Ignacio Abreu Castilla、F. Jerry Reen、David F. Woods、Stuart G. Collins、Fergal O'Gara、Anita R. Maguire
DOI:10.1002/adsc.201801691
日期:2019.6.6
Evaluation of an esterase annotated as 26D isolated from a marine metagenomic library is described. Esterase 26D was found to have a unique substratescope, including synthetic transformations which could not be readily effected in a synthetically useful manner using commercially available enzymes. Esterase 26D was more selective towards substrateswhich had larger, more sterically demanding substituents
Influence of the Tricarbonyl Chromium Complexation of Cyclic Alcohols and of the Planar Chirality on the Kinetic Resolution by Candida Cylindracea Lipase
Abstract Tricarbonylchromium complexes of 1-indanol, 1-tetralol, 2-tetralol and the uncomplexed counterparts were kinetically resolved by asymmetric esterification with the Candida cylindracea lipase. We observed a beneficial effect of the tricarbonyl chromium group on the enantioselectivity and we have studied the implication of the relative positions of the tricarbonylchromium group and the alcohol
Monocarboxylation and Intramolecular Coupling of Butenylated Arenes via Palladium-Catalyzed C–H Activation Process
作者:Rui Liu、Ze-Hai Lu、Xiao-Hui Hu、Jun-Li Li、Xian-Jin Yang
DOI:10.1021/acs.orglett.5b00376
日期:2015.3.20
A novel and practical reaction for the direct intramolecular oxidative coupling of butenylated arenes is reported. With the catalysis of Pd(OAc)(2), reactions of various butenylated arenes and carboxylic acids with Selectfluor reagent in CH3CN solution afforded the corresponding monocarboxylation/cyclization products in good yields under mild conditions. This research demonstrated an economic method with the synthesis of 2-tetralyl carboxylic esters, a valuable class of bioactive compounds.