Synthesis of 1,3,4-Trisubstituted Pyrazoles from α-(1,3-Dithian-2-yl) Enamine Ketones via [4+1] Cyclization
作者:Qun Liu、Shugang Wang、Yongguang Li、Xihe Bi
DOI:10.1055/s-0034-1378858
日期:——
A novel method for the synthesis of 1,3,4-trisubstituted pyrazoles from α-(1,3-dithian-2-yl) enamine ketones and primary amines, involving copper(II)-catalyzed oxidative N–N coupling, has been developed. This unprecedented [4+1] approach is versatile in the synthesis of N -aryl, N -benzyl and N -alkyl pyrazoles, and provides an alternative to the conventional [3+2] methods.
一种从 α-(1,3-dithian-2-yl) 烯胺酮和伯胺合成 1,3,4-三取代吡唑的新方法,涉及铜 (II) 催化的氧化 N-N 偶联。发达。这种前所未有的 [4+1] 方法可用于合成 N-芳基、N-苄基和 N-烷基吡唑,并提供了传统 [3+2] 方法的替代方法。