The development of Minisci acylation on electron-rich pyrroles under silver-free neutral conditions has been reported featuring the regioselective monoacylation of (NH)-free pyrroles. Unlike conventional Minisci conditions, the avoidance of any acid that could result in the polymerization of pyrroles was the key to success. The umpolung reactivity of the nucleophilic acyl radical, generated in situ
据报道,在无
银中性条件下富电子
吡咯的Minisci酰化反应的发展具有无(NH)
吡咯的区域选择性单酰化的特征。与常规的Minisci条件不同,避免任何可能导致
吡咯聚合的酸是成功的关键。由芳基
乙醛酸原位产生的亲核酰基自由基的uppolung反应性可以帮助解释富电子
吡咯产物形成的机理。备选地,提出了缺电子的
吡咯自由基阳离子上的酰基的亲核取代。