Primary amides were easily prepared in 22–99% yields from the corresponding carboxylic acids 1 or 5 with NH4Cl via activation with ClCO2Et and Et3N. The enantiomers of the corresponding primary ami...
Reduction of Symmetric and Mixed Anhydrides of Carboxylic Acids by Sodium Borohydride with Dropwise Addition of Methanol
作者:Kenso Soai、Shuji Yokoyama、Katsuko Mochida
DOI:10.1055/s-1987-28035
日期:——
Symmetric and mixed anhydrides of carboxylic acids are reduced in high yields with sodium borohydride in tetrahydrofuran with dropwise addition of methanol.
Traceless selenocarboxylates for the one-pot synthesis of amides and derivatives
作者:Luana Silva、Alisson R. Rosário、Bianca M. Machado、Diogo S. Lüdtke
DOI:10.1016/j.tet.2020.131834
日期:2021.1
procedure for glycosyl amides synthesis using selenocarboxylate as traceless reagent. Herein, we present a further application of selenocarboxylate-azide reaction for amide bond formation on a broader range of substrates, including heterocyclic systems and fatty acid. This method proved to be highly efficient for the synthesis of primary and secondary amides, sulfonamides, imides, phosphoramide and also
A convenient method for the preparation of hydroxamic acids
作者:A.Sekar Reddy、M.Suresh Kumar、G.Ravindra Reddy
DOI:10.1016/s0040-4039(00)01058-3
日期:2000.8
A one-step conversion of carboxylic acid to hydroxamic acid, under neutral pH conditions is described. This simple, selective and efficient method was applied to a wide range of aliphatic/aromatic carboxylic acid derivatives that contain hydroxyl, halo, ester and other base sensitive groups as substituents. The method utilizes cheaply available reagents and hence it is a practical and cost effective
Ethenolate Transfer Reactions: A Facile Synthesis of Vinyl Esters
作者:Srinivasan Kaliyaperumal Appaye、Satish Pandurang Nikumbh、Rajeshwar Reddy Govindapur、Shyamapada Banerjee、Dinesh S. Bhalerao、Unniaran K. Syam Kumar
DOI:10.1002/hlca.201300396
日期:2014.8
and efficient metal‐free ethenolate transfer reaction has been elaborated in moderate‐to‐high yields from vinyl acetate. This reaction was accomplished by generation of potassium ethenolate, which was then reacted with homo and mixed anhydrides of aliphatic, aryl and heteroaryl acids, to yield the corresponding vinylesters. The utility of thus generated vinylesters was then probed by carrying out intramolecular