A convenient and efficient preparation of β-substituted α-haloenones from diazodicarbonyl compounds
作者:Yong Rok Lee、Bang Sub Cho、Hyuk Jin Kwon
DOI:10.1016/j.tet.2003.09.087
日期:2003.11
Rhodium(II)-catalyzed reactions of cyclic diazodicarbonyl compounds with a variety of halides have been examined. With acid halides, β-acyloxy α-haloenones are produced in good yields. With benzyl halides, β-benzyloxy α-haloenones are obtained in good yields. Reactions with methylene halides yield β-halomethoxy α-haloenones in good yields, whereas reactions with ethyl halides and ethylene dihalides
已经研究了铑(II)催化的环状重氮二羰基化合物与各种卤化物的反应。用酰基卤可以高收率生产β-酰氧基α-卤代烯酮。使用苄基卤化物,可以良好的产率获得β-苄氧基α-卤代烯酮。与亚甲基卤的反应以良好的产率产生β-卤代甲氧基α-卤代烯酮,而与乙基卤和乙二卤的反应以高产率产生β-羟基α-卤代烯。这些反应提供了有用且快速的进入β-取代的α-卤代烯酮的途径。还已经用卤化pathway描述了形成这些产物的机理途径。