期刊
TETRAHEDRON LETTERS
卷 42, 期 30, 页码 5013-5016出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(01)00923-6
关键词
coupling reagents; amino acids; carboxylic acids; hydroxamates; Weinreb amides
Tetrafluoroborate and hexafluorophosphate thiouronium salts derived from 2-mercaptopyridone-1-oxide and tetramethylurea (TOTT and HOTT) or N,N ' -dimethylpropyleneurea (TODT and HODT) convert carboxylic acids to Weinreb amides and N-methoxy or N-benzoxyamides in high yields by reaction with N,O-dimethylhydroxylamine and O-methyl- or O-benzyl-hydroxylamine hydroxylamine hydrochlorides. respectively. in the presence of triethylamine or DIEA. (C) 2001 Elsevier Science Lid. All rights reserved.
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