mechanochemical synthesis of amides from carboxylic acids has been developed through an in situ acid activation with 2,4,6-trichloro-1,3,5-triazine and a catalytic amount of PPh3. Under room temperature solvent-drop grinding of the reactants in the presence of an inorganic base, a variety of carboxylic acids including aromatic acids, aliphatic acids, and N-protected α-amino acids undergo amidation to afford
The catalytic role of PPh3 and its polymer bound analog was investigated in the 2,4,6-trichloro-1,3,5-triazine (TCT) mediated amidation of carboxylicacids. In the presence of inorganic bases which were inert toward TCT, carboxylicacids rapidly reacted with amines to afford amides in good to excellent yields. The described method also enabled the synthesis of optically active protected dipeptides
在2,4,6-三氯-1,3,5-三嗪(TCT)介导的羧酸酰胺化反应中,研究了PPh 3及其与聚合物结合的类似物的催化作用。在对TCT呈惰性的无机碱的存在下,羧酸与胺迅速反应,以良好或优异的收率得到酰胺。所描述的方法还能够在没有外消旋的情况下合成旋光保护的二肽。根据31 P NMR研究证实,在PPh 3催化的酸活化过程中形成了三嗪基氯化chloride 。
Polymer-anchored Ru(II) complex as an efficient catalyst for the synthesis of primary amides from nitriles and of secondary amides from alcohols and amines
作者:Sk Manirul Islam、Kajari Ghosh、Anupam Singha Roy、Rostam Ali Molla
DOI:10.1002/aoc.3233
日期:2014.12
Its catalytic activity was evaluated for the preparation of primaryamidesfromaqueous hydration of nitriles in neutral condition. A range of nitriles were successfully converted to their corresponding amides in good to excellent yields. The catalyst was also effective in the preparation of secondary amidesfrom the coupling of alcohols and amines. The catalyst can be facilely recovered and reused
Palladium-Catalyzed Hydroaminocarbonylation of Alkenes with Amines: A Strategy to Overcome the Basicity Barrier Imparted by Aliphatic Amines
作者:Guoying Zhang、Bao Gao、Hanmin Huang
DOI:10.1002/anie.201502405
日期:2015.6.22
A novel and efficient palladium‐catalyzed hydroaminocarbonylation of alkenes with aminals has been developed under mild reaction conditions, and allows the synthesis of a wide range of N‐alkyl linear amides in good yields with high regioselectivity. On the basis of this method, a cooperative catalytic system operating by the synergistic combination of palladium, paraformaldehyde, and acid was established
Synthesis of acyl fluorides <i>via</i> photocatalytic fluorination of aldehydic C–H bonds
作者:Michael Meanwell、Johannes Lehmann、Marc Eichenberger、Rainer E. Martin、Robert Britton
DOI:10.1039/c8cc06375c
日期:——
demonstrate that acyl fluorides can be prepared directly from aldehydes via a C(sp2)–H fluorinationreaction involving the inexpensive photocatalyst sodium decatungstate and electrophilic fluorinating agent N-fluorobenzenesulfonimide. This convenient fluorination strategy enables direct conversion of aliphatic and aromatic aldehydes into acylating agents.