Tuneable Hydrogenation of Nitriles into Imines or Amines with a Ruthenium Pincer Complex under Mild Conditions
作者:Jong-Hoo Choi、Martin H. G. Prechtl
DOI:10.1002/cctc.201403047
日期:2015.3
selective hydrogenation of aromatic and aliphatic nitriles into amines and imines is described. Using a ruthenium pincer complex, the selectivity towards amines or imines can be controlled by simple parameter changes. The reactions are conducted under very mildconditions between 50–100 °C at 0.4 MPa H2 pressure without any additives at low catalytic loadings of 0.5–1 mol %, which results in quantitative conversions
描述了将芳族和脂族腈选择性氢化为胺和亚胺的方法。使用钌钳配合物,可以通过简单的参数更改来控制对胺或亚胺的选择性。反应在0.4 MPa H 2压力下在50-100°C的非常温和的条件下进行,在0.5-1 mol%的低催化负载下没有任何添加剂,从而实现了定量转化和高选择性。
Microwave accelerated Castagnoli-Cushman reaction: Synthesis of novel 6,7,8,9-tetrahydropyrido[3′,2′:4,5]pyrrolo[1,2-a]pyrazines
作者:Devaiah Vytla、Parinita Shaw、Rajeswari Velayuthaperumal、Jithendra Emmadi、Arvind Mathur、Amrita Roy
DOI:10.1016/j.tetlet.2021.152943
日期:2021.3
acetic anhydride as a dehydrating agent was significantly accelerated by microwave irradiation. The reaction conditions offer a convenient preparation of novel 6,7,8,9-tetrahydropyrido[3′,2′:4,5]pyrrolo[1,2-a]pyrazines in moderate to good yields with good trans stereoselectivity.
使用乙酸酐作为脱水剂,各种氮杂吲哚二羧酸与亚胺的Castagnoli-Cushman反应可通过微波辐射显着加速。反应条件提供了方便的制备新型6,7,8,9-四氢吡啶并[3',2':4,5]吡咯并[1,2- a ]吡嗪的良好收率和良好的反式立体选择性。
1,1′-Carbonyldiimidazole as a cyclodehydrating agent for the Castagnoli–Cushman reaction of dicarboxylic acids and imines
作者:Evgeny G. Chupakhin、Olga Yu. Bakulina、Dmitry V. Dar’in、Mikhail Krasavin
DOI:10.1016/j.mencom.2019.05.016
日期:2019.5
A novel protocol for the Castagnoli-Cushman reaction of dicarboxylic acids and imines comprises the use of 1,1'-carbonyldiimidazole as the cyclodehydrating agent to in situ produce the intermediate anhydrides. In contrast to previously developed procedure involving the use of acetic anhydride, the current protocol allows one to utilize substrates prone to acylation or acid-promoted transformations, which significantly broadens the reaction scope of lactams to be obtained.
Synthesis of Novel 2-Alkoxy-3-amino-3-arylpropan-1-ols and 5-Alkoxy-4-aryl-1,3-oxazinanes with Antimalarial Activity
作者:Matthias D’hooghe、Stijn Dekeukeleire、Karen Mollet、Carmen Lategan、Peter J. Smith、Kelly Chibale、Norbert De Kimpe
DOI:10.1021/jm9002632
日期:2009.7.9
A variety of novel syn-2-alkoxy-3-amino-3-arylpropan-1-ols was prepared through LiAlH4-promoted reductive ring-opening of cis-3-alkoxy-4-aryl-beta-lactams in Et2O. The latter gamma-aminoalcohols were easily converted into cis-5-alkoxy-4-aryl-1,3-oxazinanes using formaldehyde in THE Both series of compounds were evaluated against a chloroquine sensitive strain of Plasmodium falciparum (D10), revealing micromolar potency for almost all representatives. Eleven compounds exhibited antimalarial activity with IC50 values of <= 30 mu M, and the majority of these compounds did not show cytotoxicity at the concentrations tested.