作者:Hiroki Fujioka、Motohiro Yasui、Shohei Hamada、Kohei Fukumi、Norihiko Takeda、Yusuke Kobayashi、Takumi Furuta、Masafumi Ueda
DOI:10.1039/d4ob00349g
日期:2024.4.24
Despite their utility as directing groups, the C–C bond cleavage of cyclopropanes utilizing hydrazones has not been explored. Herein, Pd-catalyzed C–C bond cleavage reaction of N-cyclopropyl acylhydrazones, followed by cycloisomerization to yield pyrazoles, has been developed. The protocol enables the synthesis of various α-pyrazole carbonyl compounds, which have a potential of biological activity. Control
尽管它们可用作导向基团,但尚未探索利用腙对环丙烷进行 C-C 键断裂。在此,开发了 Pd 催化N-环丙基酰腙的 C-C 键断裂反应,然后进行环异构化生成吡唑。该方案能够合成各种具有潜在生物活性的α-吡唑羰基化合物。对照实验和 DFT 计算表明,稳定的 6 元螯合钯配合物发生 β-碳消除,生成共轭吖嗪作为后续环异构化的反应中间体。