Zinc Stabilized Azo-anion Radical in Dehydrogenative Synthesis of N-Heterocycles. An Exclusively Ligand Centered Redox Controlled Approach
作者:Siuli Das、Rakesh Mondal、Gargi Chakraborty、Amit Kumar Guin、Abhishek Das、Nanda D. Paul
DOI:10.1021/acscatal.1c00275
日期:2021.6.18
efficiently dehydrogenates various saturated N-heterocycles such as 1,2,3,4-tetrahydro-2-methylquinoline, 1,2,3,4-tetrahydro-isoquinoline, indoline, 2-phenyl-2,3-dihydro-1H-benzoimidazole, 2,3-dihydro-2-phenylquinazolin-4(1H)-one, and 1,2,3,4-tetrahydro-2-phenylquinazolines, among others, under air. The catalyst has further been found to be compatible with the cascade synthesis of these N-heterocycles via
在此,我们报告了一种使用 Zn(II) 稳定的偶氮阴离子自由基配合物作为催化剂对各种 N-杂环进行脱氢的完全以配体为中心的氧化还原控制方法。一种简单、易于制备且在工作台上稳定的 Zn(II) 复合物 ( 1b ),具有三齿芳基偶氮钳,2-((4-氯苯基)二氮烯基)-1,10-菲咯啉,在锌存在下-粉尘,经过还原形成偶氮阴离子自由基物质 [ 1b ] -可有效地使各种饱和 N-杂环脱氢,例如 1,2,3,4-四氢-2-甲基喹啉、1,2,3,4-四氢-isoquinoline, indoline, 2-phenyl-2,3-dihydro-1 H -benzoimidazole, 2,3-dihydro-2-phenylquinazolin-4(1 H)-1 和 1,2,3,4-四氢-2-苯基喹唑啉等,在空气中。还发现该催化剂与通过醇与其他合适偶联伙伴在空气下脱氢偶联的这些N-杂环的级联合成相容