2-Diazo-1-(4-hydroxyphenyl)ethanone: a versatile photochemical and synthetic reagent
作者:Sanjeewa N. Senadheera、Anthony S. Evans、John P. Toscano、Richard S. Givens
DOI:10.1039/c3pp50305d
日期:2014.2
that the primary rearrangement pathway for 1a involves ketene formation in accordance with the photo-Wolff rearrangement. Furthermore we have also demonstrated the synthetic utility of 1a as an esterification and etherification reagent with a variety of substituted α-diazo-p-hydroxyacetophenones, using them as synthons for efficiently coupling it to acids and phenols to produce pHP protect substrates
α-重氮芳基酮是众所周知的底物,可通过热或光化学活化通过乙烯酮中间体将沃尔夫重排为苯乙酸。同样,α-取代的对羟基苯甲酰基(pHP) 酯是通过据称涉及环丙酮中间体的不同途径将 photo-Favorskii 重排为苯乙酸的底物。在本文中,我们表明,一系列α-重氮的光解p -hydroxyacetophenones和p -hydroxyphenacyl(PHP)α -酯两者产生相同的重排如苯乙酸主要产品。由于 α-重氮对羟基苯乙酮( 1a , pHP N 2) 包含 Wolff 或 Favorskii 重排的所有必要功能,我们被提示在有利于 photo-Favorskii 重排的条件下探索这种有趣的机械二分法,即在羟基介质中的光解。使用时间分辨红外 (TRIR) 光谱对1a转化为对羟基苯基乙酸 ( 4a )的机理进行的研究清楚地证明了乙烯酮中间体的形成,该中间体随后被溶剂或亲核试剂捕获。1a的