Palladium-Catalyzed C–H/C–H Cross-Coupling by Mechanochemistry: Direct Alkenylation and Heteroarylation of N1-Protected 1<i>H</i>-Indazoles
作者:Jingbo Yu、Xinjie Yang、Chongyang Wu、Weike Su
DOI:10.1021/acs.joc.9b02951
日期:2020.1.17
C3-(hetero)arylated 1H-indazoles are privileged structural motifs in numerous pharmaceuticals. Direct C3-alkenylation and C3-(hetero)arylation of 1H-indazoles have been significantly challenging because of the inert nature of this carbon center. Herein, we present an efficient mechanochemical strategy for palladium-catalyzed C-H/C-H cross-coupling to construct C3-alkenylated and C3-heteroarylated 1H-indazoles using
在许多药物中,C3-烯基化和C3-(杂)芳基化的1H-吲唑是优先的结构基序。由于该碳中心的惰性,直接的1H-吲唑的C3-烯基化和C3-(杂)芳基化具有很大的挑战性。在这里,我们提出了一种高效的机械化学策略,用于钯催化的CH / CH交叉偶联,以使用具有满意的产品收率和广泛的官能团耐受性的低成本铜氧化剂来构建C3-烯基化和C3-杂芳基化的1H-吲唑。PLK4抑制剂CFI-400945和HIF-1α抑制剂YC-1中间体的空前的总机械合成进一步证明了开发方案的鲁棒性。