Studies were made of the kinetics of methoxide ion-catalysed reactions of seven substituted phenyl N-(2-thiocarbamoylphenyl)carbamates, 4-methoxyphenyl N-(2-thiocarbamoylphenyl)-N-(methyl)carbamate and five substituted phenyl N-(4-thiocarbamoylphenyl)carbamates, leading to the respective cyclisation products (i.e. 4-thioxo-1H,3H-quinazolin-2-one or 1-methyl-4-thioxo-1H,3H-quinazolin-2-one) and/or methanolysis
研究是由7取代的苯基甲醇离子催化的反应的动力学ñ - (2- thiocarbamoylphenyl)氨基甲酸酯4-甲氧基苯基,ñ - (2- thiocarbamoylphenyl) - ñ - (甲基)氨基甲酸叔丁酯和5取代的苯基ñ - (4- -硫代氨基甲酰基苯基)氨基甲酸酯,产生各自的环化产物(即4-thioxo-1 H,3 H -quinazolin-2-one或1-methyl-4-thioxo-1 H,3 H -quinazolin-2-one)和/或甲醇分解产物,即N-(4-硫代氨基甲酰基苯基)氨基甲酸甲酯。2-硫代氨基甲酰基衍生物(βlg的速率常数βlg和ρ常数的比较 = -1.15,ρ= 3.1±0.1)和4-硫代氨基甲酰基衍生物(ρ= 4.6±0.2,βlg = -1.55)表明,闭环反应是通过B Ac 2机理进行的,其中的酚盐阴离子是限速步骤,而甲醇分解遵循E 1
Synthesis of Substituted 2-Benzoylaminothiobenzamides and Their Ring Closure to Substituted 2-Phenylquinazoline-4-thiones
Acylation of 2-aminothiobenzamide or 2-methylaminothiobenzamide with substituted benzoyl chlorides has been used to synthesise the corresponding 2-benzoyl-aminothiobenzamides whose subsequent sodium methoxide-catalysed ringclosure gives the corresponding quinazoline-4-thiones. These compounds were characterised by means of their 1H- and 13C-NMR spectra. The preferred tautomeric form of selected compounds