A simple, efficient and environmentally benign protocol for the synthesis of methylenebisamides and carbinolamides in high yields from aromatic amides and formaldehyde in the presence of heterogeneous catalysts (Hβ and NaY zeolites) using water as a solvent is demonstrated. Moreover, the catalyst is recyclable and can be reused without significant loss in its catalytic activity.
Visible-Light-Induced Radical Cascade Cross-Coupling via C(sp<sup>3</sup>)–H Activation and C–N/N–O Cleavage: Feasible Access to Methylenebisamide Derivatives
作者:Jinglan Lei、Min Li、Qingqing Zhang、Shuyang Liu、Haifang Li、Lei Shi、Wen-Feng Jiang、Chunying Duan、Yunhe Jin
DOI:10.1021/acs.orglett.3c00646
日期:——
Here we report facile and manipulable access to methylenebisamidederivativesvia visible-light-driven radicalcascade processes incorporating C(sp3)–Hactivation and C–N/N–Ocleavage. Mechanistic studies reveal that a traditional Ir-catalyzed photoredox pathway and a novel copper-induced complex-photolysis pathway are both involved, contributing to activating the inert N-methoxyamides and rendering
在这里,我们报告了通过包含 C(sp 3 )–H 激活和 C–N/N–O 裂解的可见光驱动的自由基级联过程,轻松且可操作地获取亚甲基双酰胺衍生物。机理研究表明,传统的 Ir 催化光氧化还原途径和新型铜诱导的复合光解途径均参与其中,有助于激活惰性N-甲氧基酰胺并提供有价值的双酰胺。这种方法具有许多优点,包括温和的反应条件、广泛的范围和官能团耐受性以及具有竞争力的步骤经济性。鉴于机械的丰富性和操作的简单性,我们相信这个一揽子交易为合成有价值的含氮分子铺平了一条有前途的道路。
Mesoionic N‐Heterocyclic Imines as Super Nucleophiles in Catalytic Couplings of Amides with CO
<sub>2</sub>
作者:Arpan Das、Pallavi Sarkar、Subir Maji、Swapan K. Pati、Swadhin K. Mandal
DOI:10.1002/anie.202213614
日期:2022.12.19
A series of mesoionic N-heterocyclic imine (mNHI) based superbases are introduced in this work. The mNHIs were utilized as metal-free catalysts in transformations using CO2 for the coupling of amides.
本文介绍了一系列基于中离子 N-杂环亚胺 (mNHI) 的超级碱。mNHI 在使用 CO 2偶联酰胺的转化中用作无金属催化剂。