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
Direct Electrochemical Synthesis of 2,3‐Disubstituted Quinoline
<i>N‐</i>
oxides by Cathodic Reduction of Nitro Arenes
作者:Johannes Winter、Tobias Prenzel、Tom Wirtanen、Dieter Schollmeyer、Siegfried R. Waldvogel
DOI:10.1002/chem.202203319
日期:2023.2.24
A simple electrochemical reductive protocol was established for the direct formation of quinoline N-oxides with mild reaction conditions, in an undivided set-up, with a broad scope. The technical significance of this method could be demonstrated on a multigram scale.
Process for preparing 2-carbamoyloxyalkyl-1,4-dihydropyridine derivatives and intermediates useful for the process
申请人:BANYU PHARMACEUTICAL CO., LTD.
公开号:EP0101023A1
公开(公告)日:1984-02-22
A process for preparing a 2-carbamoyloxyalkyl-1,4-dihydropyridine derivative represented by the general formula:
which comprises:
(a) reacting a 3-amino-3-carbamoyloxyalkylacrylic acid derivative represented by the general formula:
with a benzylidene compound represented by the general formula:
(b) reacting the 3-amino-3-carbamoyloxyalkylacrylic acid derivative of the general formula II with an aldehyde comoound reoresented bv the aeneral formula:
and a β-keto-ester compound represented by the general formula:
(c) reacting a 3-carbamoyloxyalkylpropiolic acid derivative represented by the general formula:
with the benzylidene compound of the general formula III and ammonia or its salt: or
(d) reacting the 3-carbamoyloxyalkylpropiolic acid derivative of the general formula VI with the aldehyde compound of the general formula IV, the β-keto-ester compound of the general formula V and ammonia or its salt, and the intermediates of formula II and VI.
一种制备通式为 2-氨基甲酰氧基烷基-1,4-二氢吡啶衍生物的工艺:
其中包括
(a) 将通式为 3-氨基-3-氨基甲酰氧基烷基丙烯酸衍生物与通式为
与通式代表的亚苄基化合物反应:
(b) 将通式 II 的 3-氨基-3-氨基甲酰氧基烷基丙烯酸衍生物与通式......代表的醛化合物和通式......代表的β-酮酯化合物反应:
和通式代表的 β-酮酯化合物反应:
(c) 将通式代表的 3-氨基甲酰氧基烷基丙炔酸衍生物与通式代表的 β-酮酯化合物反应:
与通式 III 的亚苄基化合物和氨或其盐反应:或
(d) 将通式 VI 的 3-氨基甲酰氧基烷基丙炔酸衍生物与通式 IV 的醛化合物、通式 V 的 β-酮酯化合物和氨或其盐以及通式 II 和 VI 的中间产物反应。
Process for preparation of substituted dihydropyridines and intermediates therefor
申请人:USV PHARMACEUTICAL CORPORATION
公开号:EP0109049A2
公开(公告)日:1984-05-23
The invention provides, a new process for preparing dihydropyridines useful in the treatment of hypertension.