Polar effects in free-radical reactions. A novel homolytic acylation of heteroaromatic bases by aerobic oxidation of aldehydes, catalysed by<i>N</i>-hydroxyphthalimide and Co salts
作者:Francesco Minisci、Francesco Recupero、Andrea Cecchetto、Carlo Punta、Cristian Gambarotti、Francesca Fontana、Gian Franco Pedulli
DOI:10.1002/jhet.5570400220
日期:2003.3
A new process for the homolytic acylation of protonated heteroaromatic bases is described; an N-oxyl radical (PINO) generated from N-hydroxyphthalimide by air oxygen and Co(II) abstracts a hydrogen atom from an aldehyde. The resulting nucleophilic acyl radical adds to a heteroaromatic base, which is then rearo-matised in a chain process. Quinazoline has an anomalous behaviour, giving 3H-quinazolin-4-one
描述了质子化杂芳族碱均质酰化的新方法。N-羟基邻苯二甲酰亚胺通过空气氧和Co(II)生成的N-氧基自由基(PINO)从醛中提取氢原子。所得的亲核酰基基团加到杂芳族碱基上,然后在链状过程中重新构型。喹唑啉具有异常行为,给出3 H-喹唑啉-4- 1是唯一的反应产物。