Highly enantioselective hydrogenation of N-phthaloyl enamides
摘要:
Rh- or Ru-catalyzed highly enantioselective hydrogenation of N-phthaloyl enamides is presented. Electron-rich Tang-Phos and DuanPhos are found to be effective ligands for Rh-catalyzed hydrogenation of alpha-aryl enamides and up to 99% ee has been achieved. In contrast, for the hydrogenation of alpha-alkyl enamide.. the Ru-C-3-TunePhos complex is more effective and up to 69% ee can be observed. This work is the first report of the hydrogenation of N-phthaloyl enamides. (c) 2005 Elsevier Ltd. All rights reserved.
excellent surface catalytic potential of Fe3O4–OSO3H is utilized in the synthesis of symmetrically and unsymmetrically substituted urea derivatives via transamidation reactions. The scope of the surface catalysis is further extended in transamidation reactions of cyclic and acyclic amide derivatives, and in the amidation of fatty acids. In both transamidation and amidation reactions, the catalyst is reusable
摘要 Fe 3 O 4 -OSO 3 H的优异的表面催化潜力可用于通过氨基转移反应合成对称和不对称取代的脲衍生物。在环和无环酰胺衍生物的氨基转移反应以及脂肪酸的酰胺化反应中,表面催化的范围进一步扩大。在氨基转移和酰胺化反应中,该催化剂可重复使用多达五次,而活性没有明显损失。 Fe 3 O 4 -OSO 3 H的优异的表面催化潜力可用于通过氨基转移反应合成对称和不对称取代的脲衍生物。在环和无环酰胺衍生物的氨基转移反应以及脂肪酸的酰胺化反应中,表面催化的范围进一步扩大。在氨基转移和酰胺化反应中,该催化剂可重复使用多达五次,而活性没有明显损失。
Boric Acid: A Highly Efficient Catalyst for Transamidation of Carboxamides with Amines
作者:Thanh Binh Nguyen、Jonathan Sorres、Minh Quan Tran、Ludmila Ermolenko、Ali Al-Mourabit
DOI:10.1021/ol301308c
日期:2012.6.15
transamidation of carboxamides with amines using catalytic amounts of readily available boric acid under solvent-free conditions has been developed. The scope of the methodology has been demonstrated with (i) primary, secondary, and tertiary amides and phthalimide and (ii) aliphatic, aromatic, cyclic, acyclic, primary, and secondary amines.
Nucleophilic Substitution Reactions of (Alkoxymethylene)dimethylammonium Chloride
作者:Anthony G. M. Barrett、D. Christopher Braddock、Rachel A. James、Nobuyuki Koike、Panayiotis A. Procopiou
DOI:10.1021/jo980583j
日期:1998.9.1
The use of imidate esters as potential replacements for diethyl azodicarboxylate and triphenylphosphine in the Mitsunobu reaction is described. A series of secondary alcohols were allowed to react with (chloromethylene)dimethylammonium chloride, generated from dimethylformamide (DMF) and oxalyl chloride, to give imidate esters. Reaction of these salts with potassium benzoate or potassium phthalimide
Novel and versatile methodology for synthesis of cyclic imides and evaluation of their cytotoxic, DNA binding, apoptotic inducing activities and molecular modeling study
作者:Alaa A.-M. Abdel-Aziz
DOI:10.1016/j.ejmech.2006.12.003
日期:2007.5
developed for synthesis of N-substituted imides. Thus, acid anhydrides, imides and dicarboxylic acids were successfully subjected to dehydrative cyclization with substituted amines using DPPOx and Et(3)N to afford N-substituted imides under mild conditions. The DNA binding and apoptosis induction were investigated with regard to their potential utility as cytotoxic agents. Molecular modeling methods
作者:Stefan G. Koenig、Charles P. Vandenbossche、Hang Zhao、Patrick Mousaw、Surendra P. Singh、Roger P. Bakale
DOI:10.1021/ol802482d
日期:2009.1.15
Imidoyl chlorides, generated from secondary acetamides and oxalylchloride, can be harnessed for a selective and practical deprotection sequence. Treatment of these intermediates with 2 equiv of propylene glycol and warming enables the rapid release of aminehydrochloride salts in good yields. Notably, the reaction conditions are mild enough to allow for a swift deprotection with no observed epimerization