AbstractThe Michael addition of enaminoesters to coumarins (1) does not lead to the formation of simple adducts3but to the rearranged 4-aryl-2-pyridone4a. Now,N-carbamoylation of the 6-amino-2-pyridone4awith alkyl isocyanates and further transformation of the corresponding novel ureido-2-pyridone derivatives6a–ginto chromeno[3,4-c]pyridines5d,gandO-acetyl derivatives7a–gare reported. All newly synthesized compounds were characterized by means of1H/13C NMR, MS, IR spectra and elemental analysis. The structure of the ureide6fand of theN-cyclohexyl-O-acetyl derivative7gwere additionally confirmed by crystal structure determinations. Acute toxicity after intraperitoneal administration, blood clotting time, analgesic activity and the effects on the hexobarbital sleeping time were tested on laboratory animals (compounds4a,6a,6c,6dand6g).
摘要:对香豆素(1)的烯胺酯进行Michael加成反应,不会形成简单的加合物3,而是形成了重排的4-芳基-2-吡啶酮4a。现在,用烷基异氰酸酯对6-氨基-2-吡啶酮4a进行N-羰基化,并将相应的新型尿素-2-吡啶酮衍生物6a-g进一步转化为色诺[3,4-c]吡啶5d、g和O-乙酰衍生物7a-g。所有新合成的化合物均通过1H/13C NMR、MS、IR光谱和元素分析进行了表征。尿素6f和N-环己基-O-乙酰衍生物7g的结构还通过晶体结构测定进行了确认。实验室动物(化合物4a、6a、6c、6d和6g)进行了腹腔内给药后的急性毒性、凝血时间、镇痛活性以及对己巴比妥睡眠时间的影响的测试。