developed. Various epoxides/aldehydes were smoothly reacted with sulfonyl hydrazides to furnish regioselectivity 3,4-disubstituted 1H-pyrazoles. The application of such an earth-abundant, readily accessible, and nontoxic catalyst provides a green approach for the construction of 3,4-disubstituted 1H-pyrazoles. A plausible reaction mechanism has been proposed on the basis of control experiments, GC-MS and
已经开发了一种通过
硅钨酸(H 4 SiW 12 O 40)催化的
环氧化物/醛和磺酰
肼的环化合成
吡唑的简单有效的方法。各种
环氧化物/醛与磺酰
肼顺利反应以提供区域选择性3,4-二取代的1 H-
吡唑。这种富含地球、易于获得且无毒的催化剂的应用为构建 3,4-二取代 1 H-
吡唑提供了一种绿色方法。在对照实验、GC-MS 和 DFT 计算的基础上,提出了一种似是而非的反应机理。