Desulfonylation of Amides using Tributyltin Hydride, Samarium Diiodide or Zinc/Titanium Tetrachloride. A Comparison of Methods
作者:Haydn S Knowles、Andrew F Parsons、Robert M Pettifer、Stéphane Rickling
DOI:10.1016/s0040-4020(00)00025-9
日期:2000.2
Deprotection of N-sulfonylated amides can be achieved by reaction with Bu3SnH, SmI2 or TiCl4/Zn. All three methods gave good yields (typically >60%) when using N-benzoyl or related amides while the corresponding N-acetyl derivatives proved to be inert to deprotection under the same reaction conditions. The mechanistic implications of this are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.
MEGURO KANJI; TAWADA HIROYUKI; SUGIYAMA YASUO; FUJITA TAKESHI; KAWAMATSU +, CHEM. AND PHARM. BULL., 34,(1986) N 7, 2840-2851
As part of a search for new antidiabetic agents, 4-oxazolealkanoic acid derivatives (III) were synthesized and tested for hypoglycemic activity in mice. 4-Oxazoleacetic acids (IIIb) bearing a styryl or a suitable aliphatic hydrocarbon moiety at the 2-position showed potent activity. The synthesis and structure-activity relationships of these compounds are presented.