The chemistry of nitro-compounds. Part II. The scope and mechanism of the base-catalysed transformations of someNN-disubstituted o-nitrobenzamides
作者:T. W. M. Spence、G. Tennant
DOI:10.1039/p19720000097
日期:——
,2′-di-carboxamide (15a); similar treatment of the amide (8b) affords the corresponding azoxybenzene derivative (16b) and benzaldehyde 2-carboxyphenylhydrazone (20). Mechanisms for the base-catalysed transformations of the amides (6a and b) and (8a and b) are discussed.
在反应通过2- cyanoquinazolone中间形成可解释Ñ -oxides(2),热乙醇乙醇钠转换Ñ -cyanomethyl- ø -nitrobenzamides(1A-c)以高产率进Ñ -hydroxyquinazolinediones(3A-C)。相反,用乙醇乙醇钠处理N-苯甲酰基甲基酰胺(6a)或N-乙氧基羰基甲基酰胺(6b)得到吲唑酮(13a)。吲唑酮(13a和b)在相似的条件下由N -α-氰基乙基酰胺(8a和b)形成。另一方面,热的含水乙醇碳酸钠将酰胺(8a)转化为吲唑酮(13a)和NN的混合物′-二苯基偶氮苯-2,2′-二羧酰胺(15a);用类似的方法处理酰胺(8b),得到相应的乙氧基苯衍生物(16b)和苯甲醛2-羧基苯基hydr(20)。讨论了酰胺(6a和b)和(8a和b)的碱催化转化机理。