4-chloro-2-oxo-2H-chromene-3-carbonitrile (1) with heteroarylamines 2a-d in acetonitrile containing a catalytic amount of triethylamine followed by spontaneous intramolecular cyclization gave the novel coumarin derivatives 3a-d, respectively. These compounds underwent acid hydrolysis giving the corresponding oxoderivatives 4a-d. The structural assignments of the synthesized compounds were based on elemental
在含有催化量的
三乙胺的
乙腈中,4-
氯-2-氧代-2- H-亚甲基-3-腈(1)与杂芳基胺2a-d缩合,然后自发地分子内环化,分别得到新的
香豆素衍
生物3a-d。这些化合物经过酸
水解,得到相应的氧代衍
生物4a-d。合成化合物的结构分配基于元素,IR,1 H和13 C NMR分析。