Heterocyclische β-Enaminoester; 55.<sup>1</sup>Imidazo[4,5-<i>d</i>]-, Thiazolo[5,4-<i>d</i>]- und Thiazolo[4,5-<i>d</i>][1,3]oxazinone
作者:Heinrich Wamhoff、Rainer Berressem、Stefan Herrmann
DOI:10.1055/s-1993-25810
日期:——
Heterocyclic ß-Enamino Esters; 55.1 Imidazo[4,5-d]-,Thiazolo[5,4-d]-, and Thiazolo[4,5-d][1,3]oxazinones 5-Aroylamino-, 3a,b, and 5-(3-arylureido)-1-benzyl-1H-imidazole-4-carboxylates 6a,b are converted with dichlorotriphenylphosphorane into 3-benzyl-3,7-dihydro-imidazo[4,5-d][1,3]oxazin-7-ones 4a,b and 7a,b, respectively. Similarly, 5-aroylamino-4-thiazole-carboxylates 10a-f and 4-aroylamino-5-thiazolecarboxylates 14a-d are cyclized with dibromotriphenylphosphorane (11) to afford thiazolo[5,4-d]-, 12a-f, and thiazolo[4,5-d][1,3]oxazin-7-ones 15a-d, respectively.
杂环 ß-肉桂酸酯;55.1 咪唑并[4,5-d]-、噻唑并[5,4-d]-和噻唑并[4,5-d][1,3]恶嗪酮 5-丙酰基氨基、3a,b 和 5-(3-芳脲基)-1-苄基-1H-咪唑-4-羧酸盐 6a、b 与二氯三苯基膦一起分别转化为 3-苄基-3,7-二氢咪唑并[4,5-d][1,3]恶嗪-7-酮 4a,b 和 7a,b。同样,5-芳酰基氨基-4-噻唑羧酸盐 10a-f 和 4-芳酰基氨基-5-噻唑羧酸盐 14a-d 与二溴三苯基膦 (11) 环化,分别生成噻唑并[5,4-d]-酮 12a-f 和噻唑并[4,5-d][1,3]恶嗪-7-酮 15a-d。