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。