A convenient synthesis of 2-amino-4<i>H</i>-1,3,4-oxadiazino[5,6-<i>b</i>]-quinoxaline derivatives
作者:Ho Sik Kim、Tong Eun Kim、Seong Uk Lee、Dong Il Kim、Sung Wook Han、Yoshihisa Okamoto、Takako Mitomi、Yoshihisa Kurasawa
DOI:10.1002/jhet.5570350650
日期:1998.11
gave ethyl 8-chloro-4-methyl-4H-1,3,4-oxadiazino[5,6-b]quinoxaline-2-carboxylate 6, whose reaction with hydrazine hydrate afforded the C2-hydrazinocarbonyl derivative 7. The reaction of compound 7 with nitrous acid provided the C2-acylazide derivative 8, which was converted into the C2-amino 9, C2-carbamate 11a-c, 12a,b, and C2-ureido 13a-c, 14 derivatives. The mass spectral fragmentation patterns were
6-氯-2-(1-甲基肼基)喹喔啉4-氧化物5与2倍摩尔量的乙二醛草酸酯的反应得到乙基8-氯-4-甲基-4 H -1,3,4-恶二嗪[ 5,6- b ]喹喔啉-2-羧酸乙酯6,其反应与水合肼,得到的C 2肼基羰基衍生物7。化合物7与亚硝酸的反应提供了C 2-酰基叠氮化物衍生物8,其被转化为C 2-氨基9,C 2-氨基甲酸酯11a-c,12a,b和C 2-脲基13a-c,14。衍生品。检查了化合物10-14的质谱碎片化图谱,其中分子离子峰未出现在化合物10c,11a-c,12a,b,13c和14的质谱图中。