Thermodynamic, spectroscopic, and density functional theory studies of allyl aryl and prop-1-enyl aryl ethers. Part 1. Thermodynamic data of isomerization
and convenient ruthenium(II) complex for the catalyticisomerization of O-allylethers, leading to thermodynamic-unfavored Z-product under mild conditions. The model substrate of allyl phenyl ether can be simply scaled up to 20 mmol to produce Z-product with TON of 2453 and TOF of 13,430 h−1 at 40–60 °C. The system of Ru(II)/Lewis Acidcatalysts was suitable for various substituted O-allylethers and other
在催化双键迁移反应中,通常以E-构型烯烃为主要产物,因为E-构型在热力学上是有利的。然而,由于结构-活性关系,有时在药物化学中需要Z-构型产物。在本文中,我们证明了一种新的策略,即路易斯酸促进了广泛使用且方便的钌(II)络合物用于O-烯丙基醚的催化异构化,导致在温和条件下产生热力学不利的Z产物。烯丙基苯基醚的模型底物可以简单地按比例放大至20 mmol以生产TON为2453,TOF为13,430 h -1的Z产物在40–60°C下。Ru(II)/路易斯酸催化剂体系适用于各种取代的O-烯丙基醚和其他类型的底物。通过包括动力学研究,配体抑制作用和分子光谱在内的机理研究,通过添加路易斯酸使PPh 3配体解离,以及由嵌合助剂形成五元Ru络合物均被认为是提高反应性和稳定性的必要步骤。通过金属氢化物加成消除机理控制催化双键迁移反应的立体选择性。这一新策略可能为生产用于药物化学的杂环化合物中热力学不利的产品提供新的机会。
Use of cyclic esters to prepare 2,3-dichloro-4-(2-thenoyl)phenoxyacetic
申请人:SmithKline Corporation
公开号:US04166061A1
公开(公告)日:1979-08-28
A new process and intermediates for preparing 2,3-dichloro-4-(2-thenoyl)phenoxyacetic acid (ticrynafen, a diuretic agent) using as a key reaction a Friedel-Crafts acylation of an esterified 3-(2,3-dichlorophenoxy)-1,2-propanediol using a thenoyl halide.
Certain 5-substituted or unsubstituted phenyl or furyl benzofuran
申请人:Merck & Co., Inc.
公开号:US04154742A1
公开(公告)日:1979-05-15
6,7-Disubstituted-5-(acyl)benzofuran-2-carboxylic acids, the pharmaceutically acceptable salt, ester and amide derivatives thereof and combinations of these compounds with antikaluretic agents are disclosed having diuretic-saluretic, uricosuric and antihypertensive activity.
2,3-Dihydro-substituted-5-benzoyl benzofuran-2-carboxylic acids and
申请人:Merck & Co., Inc.
公开号:US04401669A1
公开(公告)日:1983-08-30
2,3-Dihydro-substituted-5-(acyl)benzofuran-2-carboxylic acids, the pharmaceutically acceptable salt, ester and amide derivatives thereof and combinations of these compounds with antikaluretic agents are disclosed having diuretic-saluretic, uricosuric and antihypertensive activity.
2,3-Dihydro-6,7-disubstituted-5-(acyl)benzofuran-2-carboxylic acids, the pharmaceutically acceptable salt, ester and amide derivatives thereof and combinations of these compounds with antikaluretic agents are disclosed having diuretic-saluretic, uricosuric and antihypertensive activity.