Formation of carboxamides by direct condensation of carboxylic acids and amines in alcohols using a new alcohol- and water-soluble condensing agent: DMT-MM
摘要:
Selective formation of carboxamides in an alcohol or water by an exceptionally convenient one-step procedure in which a condensing agent is simply added to a mixture of acids and amines has been achieved successfully by using a new condensing agent, 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMT-MM). Activation of carboxylic acids by DMT-MM in the presence of amines and subsequent aminolysis of the resulting acyloxytriazine in alcoholic solvents occurred selectively and led to the formation of carboxamides in excellent yields. The rate of aminolysis of the acyloxytriazine intermediate can be estimated to be about 2x10(4) times greater than that of methanolysis. The amide/ester selectivity observed using DMT-MM was much larger than that obtained with DCC or EDC. Condensation of polar substrates, such as amino acid esters and their hydrochlorides, glucosamine hydrochloride, sodium acetate and dicarboxylic acids, proceeded successfully in MeOH, water or aqueous MeOH in good yields. The present reaction is technically quite simple and easy to achieve. It proceeds by simple mixing of acids, amines and DMT-MM without any additives, and the MeOH is readily removable by a rotary evaporator after completion of the reaction. (C) 2001 Elsevier Science Ltd. All rights reserved.
Hydrogen Bond Organocatalysis of Benzotriazole in Transamidation of Carboxamides with Amines
作者:Thanh Binh Nguyen、Ali Al-Mourabit、Ludmila Ermolenko、Marie-Elise Tran Huu Dau
DOI:10.3987/com-13-s(s)41
日期:——
systems (ring-opening of four-membered rings; (ii) intramolecular assistance, or both factors); (iii) use of moisture-sensitive and/or activation reagents (up to 2–3 equivalents; borate esters, dialkylformamide dialkyl acetals, AlCl3, AlMe3, HCl). Examples of transamidation from the Stahl's group provided an elegant possibility of preparing amides under mild † This paper is dedicated to Prof. Victor
Cleavage of 1,3-dicarbonyls through oxidative amidation
作者:Phillip Biallas、Andreas P. Häring、Stefan F. Kirsch
DOI:10.1039/c7ob00731k
日期:——
A mild and convenient protocol for the oxidative cleavage of 1,3-diketone compounds is described. Under metal-free conditions, the method converts the 1,3-dicarbonyls into amides when treated with (nBu4N)N3 and iodine in the presence of an amine at room temperature. Using this method, a range of 1,3-dicarbonyls with various structural motifs including sterically demanding substituents and ordinary
描述了一种温和方便的方案,用于1,3-二酮化合物的氧化裂解。在无金属的条件下,该方法在室温下在胺的存在下用(n Bu 4 N)N 3和碘处理时,可将1,3-二羰基化合物转化为酰胺。使用这种方法,很容易将一系列具有各种结构基序的1,3-二羰基(包括空间上必不可少的取代基和普通官能团)片段化,并证明环状的1,3-二羰基可以通过开环直接转化为无环二酰胺。 。最初的机理研究表明,烯醇形式的叠氮化后是胺的亲核取代。
N-BENZYLAMIDES AS DERIVATIVES FOR IDENTIFYING THE ACYL GROUP IN ESTERS<sup>1,2</sup>
作者:O. C. DERMER、JACK KING
DOI:10.1021/jo01190a008
日期:1943.3
Onda; Kunugi, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1958, vol. 78, p. 690