Cyclopalladation of N-phenylbenzamides: Synthesis and structure of bimetallic palladium(II)-complexes
摘要:
Three bimetallic palladium(II) complexes were generated by cyclopalladation of N-methyl-N-phenylbenzamide derivatives, substrates known to undergo oxidative intramolecular cross-coupling via palladium catalysis. These isolable Pd-complexes were characterized by X-ray crystallography. Stoichiometric and catalytic experiments with [(3-methoxy-N-methyl-N-phenylbenzamide)Pd(mu-TFA)](2) were investigated, and this palladium complex was found to be an effective precatalyst for oxidative cross-coupling. (C) 2011 Elsevier B. V. All rights reserved.
KMnO4-mediated oxidative C N bond cleavage of tertiary amines: Synthesis of amides and sulfonamides
作者:Zhang Zhang、Yong-Hong Liu、Xi Zhang、Xi-Cun Wang
DOI:10.1016/j.tet.2019.03.047
日期:2019.5
KMnO4-mediated oxidative CN bond cleavage of tertiaryamines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.
The first B(C6F5)3‐catalyzed deoxygenative reduction of amides into the corresponding amines with readily accessible and stable ammonia borane (AB) as a reducing agent under mild reaction conditions is reported. This metal‐free protocol provides facile access to a wide range of structurally diverse amine products in good to excellent yields, and various functional groups including those that are reduction‐sensitive
据报道,在温和的反应条件下,用易于获得且稳定的氨硼烷(AB)作为还原剂,将酰胺进行的首次B(C 6 F 5)3催化脱氧还原为相应的胺。该无金属方案可轻松获得各种结构多样的胺产品,且收率高至优异,并且对各种官能团(包括对还原敏感的官能团)均具有良好的耐受性。该新方法也适用于手性酰胺底物,而不会破坏对映体的纯度。BF 3 OEt 2助催化剂在该反应中的作用是通过酰胺-硼加合物的原位形成来活化酰胺羰基。
Ru‐Catalyzed Deoxygenative Transfer Hydrogenation of Amides to Amines with Formic Acid/Triethylamine
ruthenium(II)‐catalyzed deoxygenative transfer hydrogenation of amides to amines using HCO2H/NEt3 as the reducing agent is reported for the first time. The catalyst system consisting of [Ru(2‐methylallyl)2(COD)], 1,1,1‐tris(diphenylphosphinomethyl) ethane (triphos) and Bis(trifluoromethane sulfonimide) (HNTf2) performed well for deoxygenative reduction of various secondary and tertiary amides into the corresponding
首次报道了使用HCO 2 H / NEt 3作为还原剂的钌(II)催化的酰胺脱氧转移胺成胺。催化剂体系由[Ru(2-甲基烯丙基)2(COD)],1,1,1-三(二苯基膦甲基)乙烷(triphos)和双(三氟甲烷磺酰亚胺)(HNTf 2)在将各种仲酰胺和叔酰胺脱氧还原成相应的胺方面表现出色,选择性极好,并且对包括还原敏感基团在内的官能团表现出很高的耐受性。氢源和酸助催化剂的选择对于催化至关重要。机理研究表明,通过借入氢对原位生成的醇和胺进行还原胺化是主要途径。
Novel 4- and 7-Sulfonylated 2-Substituted Benzoxazoles
作者:Jacqueline Marchand-Brynaert、Frédéric Bruyneel
DOI:10.1055/s-0030-1258494
日期:2010.8
The efficient synthesis of sulfonylated benzoxazoles at positions C4 or C7 is reported. The condensation reactions involve original anilide acetal reagents which, upon acid catalysis, allow an easy cyclization reaction with the sulfonylated o-aminophenol partners. This method circumvents the classical use of orthoesters which drawback is the limited access to aromatic reagents.
Supported Palladium Nanoparticles that Catalyze Aminocarbonylation of Aryl Halides with Amines using Oxalic Acid as a Sustainable CO Source
作者:C. Bal Reddy、Shankar Ram、Ajay Kumar、Richa Bharti、Pralay Das
DOI:10.1002/chem.201900271
日期:2019.3.15
Polystyrene‐supported palladium (Pd@PS) nanoparticles (NPs) have been used to catalyze the aminocarbonylation of arylhalides with amines using oxalic acid as a CO source for the first‐time for the synthesis of amides. Furthermore, o‐iodoacetophenones participated in amidation and cyclization reactions to give isoindolinones in a single step following a concerted approach. Oxalic acid has been used