Facile synthesis of novel 3-quinoxalinyl-1,5-benzodiazepines<i>via</i>ring transformation. Stable tautomers in the 1,5-benzodiazepin-2-one ring system
作者:Yoshihisa Kurasawa、Yoshihisa Okamoto、Kuniyoshi Ogura、Atsushi Takada
DOI:10.1002/jhet.5570220308
日期:1985.5
Novel 3-quinoxalinyl-1,5-benzodiazepines 4, 5, 6, 9, 10 were synthesized via the ring transformation of 3-(N,N-dimethylcarbamoyl)furo[2,3-b]quinoxaline hydrochloride (1). The 3-quinoxalinyl-1,5-benzodiazepine hydrochlorides 4 and 6 are the tautomers of the N1′-H (or N5-H) form and the C3-H form, respectively, which are stable in solid and solution. However, 4 (NH form) was found to be converted into
新的3-喹喔啉基-1,5-苯并二氮类4,5,6,9,10,合成通过3-(环改造N,N-二甲基氨基甲)呋喃并[2,3- b ]喹喔啉盐酸盐(1)。3 quinoxalinyl- 1,5-苯并二氮杂盐酸盐4和6是所述N个的互变异构体1' -H(或N 5 -H)形式以及C 3 -H形式,分别,这是在固体和溶液是稳定的。但是,发现4(NH形式)转化为6(C 3-H形式)在乙酸中回流。描述了这些互变异构体的各个光谱证据和不同的反应性。