Synthesis of 1-(2-hydroxyphenyl)-2,4-imidazolidinedione derivatives through cyclic transformations of ethyl 2-oxo-3(2<i>H</i>)-benzoxazoleacetate derivatives
作者:René Milcent、Anna Akhnazarian、Nathalie Lensen
DOI:10.1002/jhet.5570330645
日期:1996.11
A series of ethyl 2-oxo-3(2H)-benzoxazoleacetate derivatives 2 have been synthesized. By reaction with ammonia, primary amines or hydrazine, these compounds 2 were transformed into 1-(2-hydroxyphenyl)-2,4-imidazolidinedione derivatives 4, 5 and 6, respectively. Some of these new hydantoins 4, treated with phosphorus oxychloride, gave 3H-2-oxoimidazo[2,1-b]benzoxazole derivatives 9. Ethyl 2-oxo-3(2H
合成了一系列2-氧代-3(2 H)-苯并恶唑乙酸乙酯衍生物2。通过与氨,伯胺或肼反应,将这些化合物2分别转化为1-(2-羟苯基)-2,4-咪唑烷二酮衍生物4、5和6。这些新的乙内酰脲4,用三氯氧磷处理后,得到3 H -2-氧代咪唑并[2,1- b ]苯并恶唑衍生物9。通过丙烯酸乙酯与2-苯并恶唑酮(1a)的Michaël反应制备2-氧代-3(2 H)-苯并恶唑丙酸乙酯(10)。带10,在氨或烷基胺的存在下未观察到环状转化。