Generation and reactivity of 3-carbethoxy-5-phenyl-<i>5H,7H</i>-thiazolo[3,4-<i>c</i>]oxazol-4-ium-1-olate
作者:Teresa M. V. D. Pinho e Melo、Clara S. B. Gomes、Maria I. L. Soares、Antóanio M. d'A Rocha Gonsalves、José A. Paixão、Ana M. Beja、Manuela Ramos Silva
DOI:10.1002/jhet.5570410403
日期:2004.7
3-Carbethoxy-5-phenyl-5H,7H-thiazolo[3,4-c]oxazol-4-ium-1-olate was generated from (2R,4R)-N-ethoxyoxalyl-2-phenylthiazolidine-4-carboxylic acid and its reactivity studied. This münchnone showed low reactivity as dipole although from the reaction with dimethyl acetylenedicarboxylate the corresponding (3R)-3-phenyl-17H,3H-pyrrolo[1,2-c]thiazole-5,6,7-tricarboxylate could be isolated. The thermolysis
由(2 R,4 R)-N-乙氧基草酰-2-苯基噻唑烷-生成3-甲氧乙氧基-5-苯基-5 H,7 H-噻唑并[3,4- c ]恶唑-4--1-酸。研究了4-羧酸及其反应性。尽管从与乙炔二甲酸二甲酯的反应中可以得到相应的(3 R)-3-苯基-17 H,3 H-吡咯并[1,2- c ]噻唑-5,6,7-三羧酸酯,但该慕尼黑酮显示出低的偶极反应性。隔离的。(2 R,4 R)-N的热解-乙氧基草酰-2-苯基噻唑烷-4-羧酸在回流的乙酸酐中导致了N-(1-乙氧基羰基-2-苯基乙烯基)-2-苯基-4-硫代-1,3-噻唑烷的合成。通过X射线晶体学测定(2 R,4 R)-N-乙氧基草酰-2-苯基噻唑烷二-4-羧酸甲酯的结构。