Metal-free, visible-light-promoted oxidative radical cyclization of <i>N</i>-biarylglycine esters: one-pot construction of phenanthridine-6-carboxylates in water
作者:Palani Natarajan、Deachen Chuskit、Priya Priya
DOI:10.1039/c9gc01557d
日期:——
A metal-free, visible-light (blue LED: hν = 425 ± 15 nm) photoredox-catalyzed intramolecular cyclization reaction of N-biarylglycine esters to phenanthridine-6-carboxylates in water under an open air atmosphere at ambient conditions has been developed. A plausible mechanism is proposed for the reaction. Using a catalytic amount (5 mol%) of rose bengal and a blue LED, the N-biarylglycine esters were
已经开发了一种无金属的可见光(蓝色LED:hv = 425±15 nm)在环境空气中,在水中,N-联芳基甘氨酸酯在水中进行光氧化还原催化的分子内环化反应生成菲啶-6-羧酸盐。对于该反应,提出了合理的机制。使用催化量(5 mol%)的玫瑰红和蓝色LED,N-联芳基甘氨酸酯转化为自由基中间体,然后进行分子内环化反应,然后在一个锅中脱氢,以最高93%的收率得到所需产物。与报告的菲啶合成方法相比,该方法与克级合成,生态友好性和原子经济性有关。而且,就我们所知,迄今为止,没有关于廉价和生物相容的N-联芳基甘氨酸酯到菲啶的可见光光催化转化的实例。