Tetramethyl Orthosilicate (TMOS) as a Reagent for Direct Amidation of Carboxylic Acids
作者:D. Christopher Braddock、Paul D. Lickiss、Ben C. Rowley、David Pugh、Teresa Purnomo、Gajan Santhakumar、Steven J. Fussell
DOI:10.1021/acs.orglett.7b03841
日期:2018.2.16
Tetramethyl orthosilicate (TMOS) is shown to be an effective reagent for direct amidation of aliphatic and aromatic carboxylic acids with amines and anilines. The amide products are obtained in good to quantitative yields in pure form directly after workup without the need for any further purification. A silyl ester as the putative activated intermediate is observed by NMR methods. Amidations on a
作者:José G. Hernández、Karen J. Ardila-Fierro、Deborah Crawford、Stuart L. James、Carsten Bolm
DOI:10.1039/c7gc00615b
日期:——
Mechanochemical chemoenzymatic peptide and amidebondformation catalysed by papain was studied by ball milling. Despite the high-energy mixing experienced inside the ball mill, the biocatalyst proved stable and highly efficient to catalyse the formation of α,α- and α,β-dipeptides. This strategy was further extended to the enzymatic acylation of amines by milling, and to the mechanosynthesis of a derivative
Methyltrimethoxysilane (MTM) as a Reagent for Direct Amidation of Carboxylic Acids
作者:D. Christopher Braddock、Joshua J. Davies、Paul D. Lickiss
DOI:10.1021/acs.orglett.1c04265
日期:2022.2.11
reagent for the direct amidation of carboxylicacids with amines. Two simple workup procedures that provide the pure amide product without the need for further purification have been developed. The first employs an aqueous base-mediated annihilation of MTM. The second involves simple product crystallization from the reaction mixture providing a low process mass intensity direct amidation protocol.