Cyclisation of α-acylamino-acids in the presence of perchloric acid to give 5-oxo-Δ<sup>2</sup>-oxazolinium perchlorates
作者:G. V. Boyd、P. H. Wright
DOI:10.1039/p19720000909
日期:——
benzaldehyde to give the hydroperchlorate of the labile geometrical isomer of 4-benzylidene-2-phenyloxazolinone. Ten N-substituted oxo-oxazolinium perchlorates were prepared and their reactions with benzaldehyde and amines are reported. The bicyclic perchlorate, obtained from p-nitrobenzoyl-L-proline, is easily racemised, probably via a mesoionic oxazolium oxide; the corresponding diphenylamino-compound is optically
乙酸酐和高氯酸的简单α酰氨基酸的产率-5-氧代Δ动作2个-oxazolinium高氯酸盐,其可以被去质子化,以相应的饱和恶唑啉-5-酮。N-苯甲酰基-L-苯基丙氨酸得到L -4-苄基-2-苯基恶唑啉酮的氢高氯酸盐。由马尿酸制得的盐在用水,甲醇和各种胺处理后会发生开环反应。它与苯甲醛缩合,得到4-亚苄基-2-苯基恶唑啉酮的不稳定几何异构体的氢高氯酸盐。制备了十种N-取代的氧代-恶唑啉鎓高氯酸盐,并报道了它们与苯甲醛和胺的反应。从p获得的双环高氯酸盐-硝基苯甲酰基-L-脯氨酸很容易消旋,可能是通过中性离子的恶唑鎓氧化物消旋;相应的二苯氨基化合物是光学稳定的。