Synthesis of Pyrazoles, Diazepines,
Enaminones, and Enamino Esters Using 12-Tungstophosphoric Acid as
a Reusable Catalyst in Water
作者:Zhicai Shang、Jun Wu、Xiang Chen、Jin She、Haifeng Wu、Peizhi Zhang
DOI:10.1055/s-0028-1083169
日期:——
12-Tungstophosphoric acid (H3PW12O40) is found to be an efficient and recyclable catalyst in promoting a chemo- and regioselective condensation of hydrazines/hydrazides, diamines, and primary amines with various 1,3-dicarbonyl compounds in pure water at room temperature to afford pyrazoles, diazepines, and enaminones/enamino esters, respectively, in high yields.
发现12-磷钨酸(H3PW12O40)是一种高效且可循环利用的催化剂,能够在纯水条件下、室温下促进肼/酰肼、二胺及伯胺与多种1,3-二羰基化合物进行化学选择性和区域选择性的缩合反应,分别高产率地生成吡唑、二氮杂环庚烷和烯胺酮/烯胺酯化合物。