environmentally benign nature of this protocol. Preliminary mechanistic studies reveal that the blue LED irradiation efficiently cleaves the I–O bond of the hypervalent iodine reagent PhI(O2CCOAr)2 formed through ligand exchange between iodobenzene diacetate and arylglyoxylic acid to initiate the cascade reaction. The synthetic value of this operationally simple and energy-efficient method is further demonstrated
可见光促进的金属和光催化剂自由基级联环化肉桂酰胺与α-氧代羧酸,用于在温和条件下一锅可持续合成多种药学上重要的二氢喹啉酮支架。脱羧级联环化在室温下有效进行,不需要昂贵的光催化剂(例如Ir或Ru配合物),这表明该方案的实用性和环境友好性。初步机理研究表明,蓝色 LED 照射有效裂解高价碘试剂 PhI(O 2 CCOAr) 2的 I-O 键,该试剂是通过二乙酸碘苯和芳基乙醛酸之间的配体交换形成的,从而引发级联反应。这种操作简单且节能的方法的合成价值通过药物分子的后期功能化以优异的产率得到进一步证明。
Metal-free synthesis of carbamoylated dihydroquinolinones <i>via</i> cascade radical annulation of cinnamamides with oxamic acids
We report a metal-free procedure for the sustainable synthesis of carbamoylated dihydroquinolinones via tandemaddition–cyclization of carbamoyl radicals to cinnamamides. Readily accessible, non-toxic and inexpensive oxamic acids are used as carbamoyl radical precursors. This highly straightforward method provides a mild and environmentally friendly route showing good atom economy and excellent functional