Oxidation of 2-ethylhexahydroazeto[1', 2' : 1, 2]pyrido[3, 4-b]indole-1-carboxylate 9 with m-chloroperbenzoic acid in methylene dichloride at -5°C gava the corresponding cis-N-oxide 10, which was spontaneously transformed in tetrahydrofuran to the 3, 6-epoxy-1, 2, 3, 4, 5, 6-hexahydroazocino[5, 4-b]indole 11 (75%) via the [1, 2]-Meisenheimer rearrangement, along with a formation of the isoxazolidinone 12 (6.4%) through Cope elimination. The structural assignment of azocinoindole 11 was accomplished, mainly based on the 1H-NMR spectrum and also by chemical transformation of 11 to the azocinoindole 14.
2-ethylhexahydroazeto[1', 2' :2-ethylhexahydroazeto[1', 2' : 1, 2]pyrido[3,4-b]indole-1-carboxylate(2-乙基六氢氮杂
环丁烷并[1', 2' : 1, 2]
吡啶并[3,4-b]
吲哚-1-
羧酸 9)与间
氯过
苯甲酸(m-chloroperbenzoic acid)在
二氯甲烷中于 -5°C 氧化生成相应的顺式-N-氧化物 10、6-epoxy-1, 2, 3, 4, 5, 6-hexahydroazocino[5, 4-b]indole 11 (75%),同时通过 [1, 2]-Meisenheimer 重排生成
异噁唑烷酮 12 (6. 4%) 。4%)。主要根据 1H-NMR 光谱,并通过将 11
化学转化为偶氮
吲哚 14,完成了偶氮
吲哚 11 的结构鉴定。