The direct conversion of various carboxylic acids, that include stericallyhindered amino acids and di-peptides, to O-benzyl hydroxamates is demonstrated using sulfonate esters of benzotriazoles under ambient and milder conditions without significant racemization. This simple and efficient protocol is extended to the synthesis of O-benzyl hydroxamates, using in situ generated solid supported TsOBt
<i>N</i>-[(Diphenoxyphosphoryl)oxy]-2-phenyl-1<i>H</i>-benzimidazole as a versatile reagent for synthesis<i>O</i>-alkylhydroxamic acids
作者:Nagnnath D. Kokare、Devanand B. Shinde
DOI:10.1002/jhet.5570450406
日期:2008.7
Highly efficient reagent, N-[(diphenoxyphosphoryl)oxy]-2-phenyl-1H-benzimidazole was synthesized and its applicability was demonstrated for the synthesis of O-alkyl hydroxamic acids. The efficiency of the reagent was evaluated through the synthesis of range of O-alkyl hydroxamic acids from aromatic carboxylic acids as well as N-protected amino acids. The enatiomeric purity of synthesized compounds