Copper-catalyzed coupling of anthranils and α-keto acids: direct synthesis of α-ketoamides
作者:Ping-Gui Li、Hao Zhu、Min Fan、Cheng Yan、Kai Shi、Xi-Wen Chi、Liang-Hua Zou
DOI:10.1039/c9ob00822e
日期:——
Copper-catalyzed coupling of α-keto acids with anthranils is reported for the synthesis of α-ketoamides. This process involves N-O/C-O bond cleavages and C-N bond formation. Furthermore, the decarboxylation of α-keto acids can be successfully suppressed under redox-neutral conditions.
Copper-Catalyzed C-C Bond Cleavage/Double Cyclization of α-Ketoamides with o-Phenylene Diamines: Synthesis of Benzimidazo[1,2-<i>c</i>
]quinazolin-6-ones
作者:Liang-Hua Zou、Cheng Yan、Kai Shi、Liang Su、Shuai Zhu、Zhe-Kang Jia、Qiuan Wang
DOI:10.1002/ejoc.201901642
日期:2019.12.19
α‐Ketoamides have been successfully employed to synthesize benzimidazo[1,2‐c]quinazolin‐6‐ones through C–Cbondcleavage/doublecyclization, in which two new C–N and one new C=N bonds are simultaneously formed by copper catalysis under air atmosphere. This new protocol provides an important foundation for the preparation of benzimidazo[1,2‐c]quinazolin‐6‐ones in high yields.
α-酮酰胺已成功用于通过C-C键裂解/双环化反应合成苯并咪唑[1,2 - c ]喹唑啉-6-酮,其中两个新的C–N和一个新的C = N键通过大气气氛下铜的催化作用。该新方案为高产率制备苯并咪唑[1,2 - c ]喹唑啉-6-酮提供了重要的基础。
An I2-DMSO mediated oxidativeamidation of methyl ketones using anthranils as masked N-nucleophiles has been developed for the directsynthesis of α-ketoamides with high atom-economy. This metal-free process involves reductive N–Obond cleavage of anthranils and oxidative C–N bondformation of methyl ketones under mild conditions. The iodo group and electrophilic formyl group provide multiple possibilities
已经开发了一种 I 2 -DMSO 介导的甲基酮氧化酰胺化,使用邻氨基苯作为掩蔽的 N-亲核试剂,用于直接合成具有高原子经济性的α-酮酰胺。这种无金属工艺涉及在温和条件下还原邻氨基苯甲酸的 N-O 键断裂和甲基酮的氧化 C-N 键形成。碘基和亲电甲酰基为α-酮酰胺的进一步官能化提供了多种可能性。
I2-DMSO mediated N1/C5 difunctionalization of anthranils with aryl methyl ketones: A facile access to multicarbonyl compounds