由N-(5-苯基-1,2,4-恶二唑-3-基)甲亚胺酸乙酯合成1-取代的3-氨基-1 H -1,2,4-三唑
摘要:
已经开发了合成1-取代的3-氨基-1 H -1,2,4-三唑的通用且有效的方法。从N-(5-苯基-1,2,4-恶二唑-3-基)甲亚胺酸乙酯(1a)制备了所需的3-氨基-1 H -1,2,4-三唑(3),具有良好的收率。)和苯胺或胺(2)通过一锅法,包括形成甲酰胺并随后进行热单环重排。苯甲酰基保护基很容易通过硫酸促进的脱保护作用而除去。
Negishi Approach to 1,5-Disubstituted 3-Amino-1<i>H</i>-1,2,4-triazoles
作者:Jeff Shen、Brian Wong、Chunang Gu、Haiming Zhang
DOI:10.1021/acs.orglett.5b02021
日期:2015.10.2
An efficient synthesis of 1,5-disubstituted 3-amino-1H-1,2,4-triazoles has been achieved via a Negishi coupling of aryl or vinyl bromides and 1-substituted 3-amino-1H-1,2,4-triazoles in the presence of Knochel’s base tetramethylpiperidinylzinc chloride lithium chloride (TMPZnCl·LiCl) and catalyticbis(di-tert-butylphenylphosphine)palladium chloride. This chemistry tolerates a variety of electronically