Regioselective, One-Pot, Three-Component Synthesis of 1,3,4- and 1,3,5-Triarylpyrazoles from 1- and 2-Aryl-1-alkenyl Sulfones
作者:Shinichiro Fuse、Hirotaka Sugiyama、Daisuke Kobayashi、Yusuke Iijima、Keisuke Matsumura、Hiroshi Tanaka、Takashi Takahashi
DOI:10.1002/ejoc.201500562
日期:2015.7
A one-pot, three-component coupling of aldehydes with hydrazines and 1-aryl-1-alkenyl sulfones or 2-aryl-1-alkenyl sulfones for the regioselective synthesis of 1,3,4- and 1,3,5-triarylpyrazoles was developed. In our developed procedure, 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ) worked as an effective oxidant, and the addition of an strong acid was not necessary. We synthesized 1,3,4- and 1,3,5-triarylpyrazoles
醛与肼和 1-芳基-1-烯基砜或 2-芳基-1-烯基砜的一锅三组分偶联,用于区域选择性合成 1,3,4- 和 1,3,5-三芳基吡唑已开发。在我们开发的程序中,2,3-二氯-5,6-二氰基-对苯醌(DDQ)作为一种有效的氧化剂,不需要添加强酸。我们在一锅反应中以良好的收率合成了含有酸不稳定官能团的 1,3,4- 和 1,3,5-三芳基吡唑。