A simple protocol for performing chromium-catalyzed highly diastereoselective alkylations of arylmagnesium halides with cyclohexyl iodides at ambient temperature has been developed. Furthermore, this ligand-free CrCl2 enables efficient electrophilic alkenylations of primary, secondary and tetiary alkylmagnesium halides with readily available alkenyl acetates. Moreover, this chemoselective C‒C coupling
Enzyme Promiscuity as a Remedy for the Common Problems with Knoevenagel Condensation
作者:Dominik Koszelewski、Ryszard Ostaszewski
DOI:10.1002/chem.201901491
日期:2019.8
lipase‐catalyzed tandemreaction toward α,β‐enones/enoesters is presented. For the synthesis of the desired products the tandem process based on enzyme‐catalyzed hydrolysis and Knoevenagel reaction starting from enol acetates and aldehyde is developed. The relevant impact of the reaction conditions including organic solvent, enzyme type, and temperature on the course of the reaction was revealed. It
Gold(I)-Catalyzed Addition of Carboxylic Acids to Alkynes
作者:Bathoju Chandra Chary、Sunggak Kim
DOI:10.1021/jo101543q
日期:2010.11.19
Au(I)-catalyzed hydroacyloxylation of alkynes with carboxylic acids is described PPh3AuCl/AgPF6 catalyst affords the Markonikov addition products, whereas PPh3AuCl/AgOTf catalyst gives the more stable isomerized products via the Markonikov products
作者:B. D. Vineyard、W. S. Knowles、M. J. Sabacky、G. L. Bachman、D. J. Weinkauff
DOI:10.1021/ja00460a018
日期:1977.8
Preparation of Imidazole Derivatives via Bisfunctionalization of Alkynes Catalyzed by Ruthenium Carbonyl
作者:Yi-tong Ruan、Yue-peng Chen、Ling-hui Gu、Yang Luo、Ze Yang、Ling He
DOI:10.1055/s-0037-1611871
日期:2019.9
providing a simple and mild new method for the synthesis of imidazole compounds. A one-step, oxidative bisfunctionalization of alkynes to generate cis-enediol diacetates catalyzed by ruthenium carbonyl (triruthenium dodecacarbonyl) is presented. The reaction was performed using the alkyne, (diacetoxyiodo)benzene, Ru3(CO)12 as the catalyst, and toluene as the solvent at 100 °C to give the cis-enediol diacetates
抽象的 提出了炔烃的一步氧化双官能团化反应,以生成羰基钌(十二碳三钌)催化的顺式-烯二醇二乙酸酯。使用炔,(二乙酰氧基碘)苯,Ru 3(CO)12作为催化剂和甲苯作为溶剂在100°C下进行反应,以最高82%的收率得到顺式-烯二醇二乙酸酯。该方法克服了现有方法的缺点,例如乏味的反应步骤,底物的局限性以及有毒试剂的使用。此外,顺式-烯二醇二乙酸酯模块与碳酸铵[(NH 4)2 CO 3用醇溶剂制得的咪唑衍生物的收率为37-84%,因此为合成咪唑化合物提供了一种简单而温和的新方法。 提出了炔烃的一步氧化双官能团化反应,以生成羰基钌(十二碳三钌)催化的顺式-烯二醇二乙酸酯。使用炔,(二乙酰氧基碘)苯,Ru 3(CO)12作为催化剂和甲苯作为溶剂在100°C下进行反应,以最高82%的收率得到顺式-烯二醇二乙酸酯。该方法克服了现有方法的缺点,例如乏味的反应步骤,底物的局限性以及有毒试剂的使用。此外,顺式-烯二醇二乙酸酯模块与碳酸铵[(NH