Procedures for the preparation of 3-substituted 1H- and 2H-indazoles and 2-substituted indoles were developed based on cross-coupling of o-iodoarylhydrazines with copper acetylenides in pyridine or dimethylforamide. An alternative procedure for the synthesis of 3-substituted 1H-indazoles involves cyclocondensation of (2-chloroaryl)acetylenes with hydrazine hydrate in butanol.
DOI:
10.1023/a:1014071226473
作为产物:
描述:
1,3-dimethyl-5-(3-methyl-3-hydroxybutyn-1-yl)-4-chloropyrazole 在
氢氧化钾 作用下,
以
various solvent(s) 为溶剂,
以66%的产率得到4-Chloro-5-ethynyl-1,3-dimethylpyrazole
参考文献:
名称:
Equilibrium CH acidity of acetylenic derivatives of N-alkylazoles in DMSO
摘要:
The equilibrium CH acidity of a group of ethynylazoles in DMSO was measured by an intermetallization method. The dependence of the acidity of these compounds on the structure of the heterocycle, position of the ethynyl group, and nature of the substituents has been examined.