Catalytic Generation of Activated Carboxylates from Enals: A Product-Determining Role for the Base
作者:Stephanie S. Sohn、Jeffrey W. Bode
DOI:10.1021/ol051269w
日期:2005.9.1
from imidazolium or triazolium salts and bases react with enals, leading to the catalytic generation of homoenolates. The fate of these intermediates is determined by the catalytic base: strong bases such as (t)BuOK lead to carbon-carbonbondformation, while weaker bases allow protonation of the homoenolate and subsequent generation of activated carboxylates. This discovery, along with the design of a
A new catalytic transesterification promoted by a tetranuclear zinc cluster was developed. The mild reaction conditions enabled the reactions of various functionalized substrates to proceed in good to high yield. A large-scale reaction under solvent-free conditions proceeded with a low E-factor value (0.66), indicating the high environmental and economical advantage of the present catalysis.
Simple Zn(II) Salts as Efficient Catalysts for the Homogeneous Trans-Esterification of Methyl Esters
作者:Maria E. Cucciolito、Matteo Lega、Veronica Papa、Francesco Ruffo
DOI:10.1007/s10562-016-1733-6
日期:2016.6
zinc-catalyzed trans-esterification, and pointed to assess the effect of the solvent, the catalyst, its loading and the nature of the substrate. The screening disclosed the remarkable ability of zinc(II) acetate to promote the reaction in refluxing toluene at low catalyst loading. A significant improvement ensued with respect to recently results on the same reactions, in terms of less restrictive conditions
本研究旨在优化锌催化的酯交换反应,并指出评估溶剂、催化剂、其负载和底物性质的影响。筛选揭示了乙酸锌 (II) 在低催化剂负载下在回流甲苯中促进反应的显着能力。就相同反应的最新结果而言,在限制性更少的条件和更方便的催化剂前体方面取得了显着的改进。 图形摘要
Effect of acyclic monoterpene alcohols and their derivatives on TRP channels
作者:Giorgio Ortar、Aniello Schiano Moriello、Enrico Morera、Marianna Nalli、Vincenzo Di Marzo、Luciano De Petrocellis
DOI:10.1016/j.bmcl.2014.10.012
日期:2014.12
A series of thirty-six geraniol, nerol, citronellol, geranylamine, and nerylamine derivatives was synthesized and tested on TRPA1, TRPM8, and TRPV1 channels. Most of them acted as strong modulators of TRPA1 channels with EC50 and/or IC50 values <1 mu M. None was able to significantly activate TRPM8 channels, while thirteen of them behaved as 'true' TRPM8 antagonists. Little or no effect was generally observed on TRPV1 channels. Some of the compounds examined, that is, compounds 1d, g, n, 2c, d, h, i, o, 3b, e exhibited an appreciable selectivity for TRPA1 subtype. (C) 2014 Elsevier Ltd. All rights reserved.