Reactions of 2-isocyanatobenzoyl chloride and 2-carbomethoxyphenyl isocyanate with 5-aminotetrazole
作者:Norton P. Peet
DOI:10.1002/jhet.5570240141
日期:1987.1
Treatment of 2-isocyanatobenzoyl chloride (4) with 5-aminotetrazole (5-AT) gave 3-(5-tetrazolyl)quinazoline-2,4(1H,3H)-dione (1) directly. Treatment of 2-carbomethoxyphenyl isocyanate (5) with 5-AT gave 2-[((5-amino-1H-tetrazol-1-yl)carbonyl)amino]benzoic acid methyl ester (6) as a kinetic product, which was thermally isomerized to 2-[((1H-tetrazol-5-ylamino)carbonyl)amino]benzoic acid methyl ester
用5-氨基四唑(5-AT)处理2-异氰酸根合苯甲酰氯(4),直接得到3-(5-四唑基)喹唑啉-2,4(1H,3H)-二酮(1)。用5-AT处理2-羰基甲氧基苯基异氰酸酯(5),得到作为动力学产物的2-[(((5-氨基-1 H-四唑-1-基)羰基)氨基]苯甲酸甲酯(6),为热异构化为热力学更稳定的尿素2-[(((1 H-四唑-5-基氨基)羰基)氨基]苯甲酸甲酯(7)。用多磷酸将7环化,得到2-(1 H-四唑-5-基氨基)-4 H-3,1-苯并恶嗪-4-酮(2)。如nmr所示,尿素6在溶液中非常不稳定,并且容易与甲醇反应,得到2-[((甲氧羰基)氨基]苯甲酸甲酯(10)。