Synthesis of 4-aryl-2-benzazepine-1,5-diones by photocyclization of N-(2-arylethyl)phthalimides
作者:M.Rita Paleo、Domingo Domínguez、Luis Castedo
DOI:10.1016/s0040-4020(01)87039-3
日期:1994.3
The photocyclization of N-(2-arylethyl)phthalimides to 4-aryl-2-benzazepine-1,5-diones is described. We found that the presence of electron donating substituents on the aryl ring (as in 10a and b) is necessary for the cyclization process to occur. The procedure also allowed synthesis of 2-benzazepinediones with a carboxylate group at C3 (11c and d) which were obtained as 1:1 mixture of diastereoisomers
描述了N-(2-芳基乙基)邻苯二甲酰亚胺向4-芳基-2-苯并ze庚因-1,5-二酮的光环化。我们发现芳基环上的供电子取代基的存在(如10a和b所示)对于环化过程的发生是必要的。该方法还允许合成在C 3(11c和d)具有羧酸根基团的2-苯并ze庚二酮,其以非对映异构体的1:1混合物获得。照射邻苯二甲酰亚胺12的结果取决于在取代基的性质,该邻苯二甲酰亚胺在苄基的位置带有一个氧化的取代基。尝试光环化N-(茚满-2-基)邻苯二甲酰亚胺16富电子的邻苯二甲酰亚胺23失效。