Visible‐Light‐Driven Photocatalyst‐ and Additive‐Free Cross‐Coupling of β‐Ketothioamides with α‐Diazo 1,3‐Diketones: Access to Highly Functionalized Thiazolines
作者:Monish Arbaz Ansari、Dhananjay Yadav、Maya Shankar Singh
DOI:10.1002/chem.202000279
日期:2020.6.26
photocatalyst‐ and additive‐free, visible‐light‐mediated chemoselective domino protocol was devised to access fully substituted thiazoline derivatives from β‐ketothioamides and α‐diazo 1,3‐diketones at moderate temperature in open air. The reaction proceeds through in situ generation of electrophilic carbenes from α‐diazo 1,3‐diketones by a low‐energy blue LED (448 nm), which undergoes selective coupling
设计了一种无光催化剂和无添加剂,可见光介导的化学选择性多米诺方案,可在中等温度下在露天条件下接触来自β-酮硫酰胺和α-重氮1,3-二酮的完全取代的噻唑啉衍生物。反应是通过低能蓝色LED(448 nm)从α-重氮1,3-二酮原位生成亲电子碳烯进行的,该LED与亲核β-酮硫代酰胺选择性偶联,通过连续形成C-S生成噻唑啉和CN键合在一起 值得一提的是,该策略的其他优点还包括良性和清洁的条件,操作简便,可持续性,100%的碳经济,高产量以及宽泛的功能组耐受性。对照实验很好地支持了该级联反应序列的机械原理。