Experimental and theoretical studies on the effect of the oxo group in 1,4-benzodiazepines
作者:Pablo Pertejo、María García-Valverde、Pablo Peña、Nicolás A. Cordero、Tomás Torroba、Alfonso González-Ortega
DOI:10.1039/c4ob00444b
日期:——
5-dihydro-3H-benzo[e][1,4]diazepines, have been synthesized through a similar Ugi/reduction cyclization sequence. Their conformation and stability depend on the position of the tautomeric imine/enamine equilibrium present in the diazepine nucleus, which in turn depends on the relative position of the carbonyl group adjacent to the nitrogen at the 4-position in the benzodiazepine system. Moreover, the electrophilic
两个家族的区域异构的1,4-苯并二氮杂卓类化合物,4-苄基-3 H-苯并[ e ] [1,4]二氮杂庚酮-5-酮和4-苯甲酰基-4,5-二氢-3 H-苯并[ e]通过相似的Ugi /还原环化序列合成了] [1,4]二氮杂ze。它们的构象和稳定性取决于在二氮杂核中存在的互变异构亚胺/烯胺平衡的位置,这又取决于在苯并二氮杂pine系统中与氮相邻的羰基的相对位置。此外,亚胺互变异构体上的亲电子中心对于某些苯并二氮杂as作为DNA结合位点的抗肿瘤活性至关重要。已经使用DFT方法(B3LYP / 6-31G **级)通过计算研究了在存在或不存在羰基的情况下互变异构的机理。