正庚醇 、 对氯苯甲酸 在
Candida antarctica lipase B immobilised in a macroporous DVB crosslinked polymer (Novozym 435) 作用下,
以
环己烷 为溶剂,
反应 24.0h,
以100%的产率得到heptyl 4-chlorobenzoate
参考文献:
名称:
Immobilised Candida antarctica B as efficient catalyst for the synthesis of local anaesthetic intermediates
摘要:
We hereby present the development of new reaction conditions for the CALB catalysed esterification of substituted benzoic acids. Using cyclohexane as the reaction media a number of heptyl benzoates have been easily isolated in good to excellent yields (up to 100% at 80 degrees C, 20-24 h). Moreover, the catalytic system has been successfully applied to the synthesis of local anaesthetics intermediates also showing good productivity in recycling experiments. (C) 2013 Elsevier Ltd. All rights reserved.
An efficient N-heterocyclic carbene-catalyzedoxidative esterification reaction of aldehydes with alkyl halides or alkyl 4-methylbenzenesulfonate is reported. It was worth noting that (1) the configuration of alkyl halides or alkyl 4-methylbenzenesulfonates was inverted completely, and (2) the presence of oxygen was crucial for this transformation. The reaction proceeded smoothly under mild conditions
Pd/C-Catalyzed Carbonylative Esterification of Aryl Halides with Alcohols by Using Oxiranes as CO Sources
作者:Byul-Hana Min、Dong-Su Kim、Hyo-Soon Park、Chul-Ho Jun
DOI:10.1002/chem.201600570
日期:2016.4.25
A carbonylative esterification reaction between aryl bromides and alcohols, promoted by Pd/C and NaF in the presence of oxiranes, has been developed. In this process, oxiranes serve as sources of carbon monoxide by their conversion to aldehydes through a palladium‐promoted Meinwald rearrangement pathway. Intramolecular versions of this process serve as methods for the synthesis of lactones and phthalimides
NHCs-mediated benzoates formation directly from aromatic aldehydes and alkyl halides
作者:Yi Li、Wenting Du、Wei-Ping Deng
DOI:10.1016/j.tet.2012.02.079
日期:2012.5
A NHCs-mediated benzoates formation was developed by treatment of aromatic aldehydes with alkylhalides in the presence of oxygen. Corresponding benzoate derivatives were obtained in high yields up to 99%. The reaction mechanism was also discussed and a NHCs-mediated O-alkylation and subsequent oxidation process was proposed.
We hereby present the development of new reaction conditions for the CALB catalysed esterification of substituted benzoic acids. Using cyclohexane as the reaction media a number of heptyl benzoates have been easily isolated in good to excellent yields (up to 100% at 80 degrees C, 20-24 h). Moreover, the catalytic system has been successfully applied to the synthesis of local anaesthetics intermediates also showing good productivity in recycling experiments. (C) 2013 Elsevier Ltd. All rights reserved.