开发能够使一氧化二氮 (N 2 O) 重新增值的催化化学工艺是减轻其排放1,2,3,4,5,6造成的环境威胁的有吸引力的策略。传统上,N 2 O 被认为是一种惰性分子,由于其活化所需的苛刻条件(>150 °C,50-200 bar) 7,8,有机化学家难以将其用作氧化剂或 O 原子转移试剂。 9,10,11。在这里,我们报告了在温和条件下(室温,1.5-2 bar N 2 O)将 N 2 O 插入 Ni-C 键,从而提供有价值的酚并释放良性 N 2. 这种从根本上不同的有机金属 C-O 键形成步骤不同于当前基于还原消除的策略,并为将芳基卤化物转化为苯酚提供了另一种催化方法。该过程通过用于 Ni 中心的基于联吡啶的配体进行催化。该方法稳健、温和且选择性高,能够适应碱基敏感功能,并允许从密集官能化的芳基卤化物合成苯酚。尽管该协议没有提供缓解 N 2 O 排放的解决方案,但它代表了将丰富的 N 2
Nickel-catalyzed asymmetric reductive arylation of α-chlorosulfones with aryl halides
作者:Deli Sun、Guobin Ma、Xinluo Zhao、Chuanhu Lei、Hegui Gong
DOI:10.1039/d1sc00283j
日期:——
We report an asymmetric Ni-catalyzed reductive cross-coupling of aryl/heteroaryl halides with racemic α-chlorosulfones to afford enantioenriched sulfones. The reaction tolerates a variety of functional groups under mild reaction conditions, which complements the current methods. The utility of this work was demonstrated by facile late-stage functionalization of commercial drugs.
Synthesis of Acyl Hydrazides and Hydrazones from Activated Amides
作者:Sunwoo Lee、Miso Kim
DOI:10.1055/a-2270-0518
日期:——
Acyl hydrazide and acyl hydrazonesynthesis methods were developed. They involve the reaction of an activated amide with hydrazine under transition-metal-catalyst-free conditions. Additionally, acyl hydrazones were synthesized by extending the same reaction procedure in the presence of aldehydes (or ketones). These reactions were performed in an aqueous environment at 25 °C, demonstrating the successful
开发了酰肼和酰腙的合成方法。它们涉及活化酰胺与肼在无过渡金属催化剂的条件下的反应。此外,通过在醛(或酮)存在下扩展相同的反应程序来合成酰基腙。这些反应在 25 °C 的水性环境中进行,证明以高产率成功获得了所需化合物。
Novel reaction of 2-(methylthio)-1-pyrroline with acyl chlorides in the presence of triethylamine