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Semisynthesis of an analogue of antitumor bicyclic hexapeptide RA-VII by fixing the Ala-2/Tyr-3 bond to Cis by incorporating a triazole cis-amide bond surrogate.通过引入三唑顺式酰胺键替代物将Ala-2/Tyr-3键固定为顺式来进行抗肿瘤双环六肽RA-VII类似物的半合成。
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以1,3-二芳基硫脲作为脲模拟物合成芳基-(4-芳基-4H-[1,2,4]三唑-3-基)-胺的研究

Synthetic studies toward aryl-(4-aryl-4H-[1,2,4]triazole-3-yl)-amine from 1,3-diarylthiourea as urea mimetics.

作者信息

Natarajan Amarnath, Guo Yuhong, Arthanari Haribabu, Wagner Gerhard, Halperin Jose A, Chorev Michael

机构信息

Laboratory for Translational Research, 1 Kendall Square, Building 600 3rd Floor, Harvard Medical School, Cambridge, Massachusetts 02139, USA.

出版信息

J Org Chem. 2005 Aug 5;70(16):6362-8. doi: 10.1021/jo0508189.

DOI:10.1021/jo0508189
PMID:16050698
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3258527/
Abstract

A thiophile-promoted synthesis of disubstituted 4H-[1,2,4]triazole-3-yl-amines as urea mimetics from the corresponding 1,3-disubstituted thioureas has been studied, and the scope and limitations of this reaction are presented. The reaction proceeds through the formation of a carbodiimide, followed by a sequential addition--dehydration with acyl hydrazides. 1,3-Branched dialkylthioureas result in the formation of the corresponding ureas. The electronic and steric effects of the substitution on the phenyl rings of the 1,3-diarylthioureas play an important role in the formation of the intermediary carbodiimde and the direction of the subsequent ring closure of the N-acyl hydrazide adduct.

摘要

研究了一种由亲硫试剂促进的、从相应的1,3-二取代硫脲合成作为尿素模拟物的二取代4H-[1,2,4]三唑-3-基胺的方法，并阐述了该反应的适用范围和局限性。该反应通过形成碳二亚胺进行，随后与酰肼依次进行加成-脱水反应。1,3-支链二烷基硫脲会生成相应的脲。1,3-二芳基硫脲苯环上取代基的电子效应和空间效应在中间体碳二亚胺的形成以及随后N-酰肼加合物的闭环方向中起着重要作用。