中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,3,4,9-四氢-1H-咔唑-1-酮 | 1-oxo-2,3,4,9-tetrahydrocarbazole | 3456-99-3 | C12H11NO | 185.225 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2,3,4,9-tetrahydro-1H-carbazol-1-amine | 118498-95-6 | C12H14N2 | 186.257 |
Synthesis of a series of novel 3-phenylisoxazolo[3,4-a]-carbazoles has been accomplished by aroylation of dianions of l-hydroxyimino-l,2,3,4-tetrahydrocarbazoles with ethyl benzoate followed by acid cyclization.
The reaction of methyl 2-(1-oxo-2,3,4,9-tetrahydro-1 H-carbazol-2-yl)oxoacetates (1a-e) with hydroxylamine hydrochloride in alcoholic KOH afforded 1-hydroxyimino-2,3,4,9-tetrahydro-1 H-carbazoles (2a-e), and in acetic acid methyl isoxazolo[5,4- a]carbazole-3-carboxylates (3a-e). Ketoesters 1a-e with urea and thiourea under acidic conditions yielded a mixture of the respective 1-hydroxycarbazoles (6a-e) and 2,3,4,9-tetrahydro-1 H-carbazol-1-ones (7a-e), but under basic conditions the respective 1-carbimido- and 1-thiocarbimido-2,3,4,9-tetrahydro-1 H-carbazoles (8a-e and 9a-e) were formed. Plausible mechanisms are proposed.
1-Hydroxyimino-1,2,3,4-tetrahydrocarbazoles (1) were reduced with zinc in acetic acid and acetic anhydride and with bakers’ yeast in an aim to synthesize 1-aminocarbazoles, but interestingly the reaction gave hitherto unknown compounds, 2-acetoxy-1-(acetylamino)carbazoles (2) and 6- [acetoxy(hydroxy)methyl]-1-hydroxylaminocarbazoles (3), respectively. A plausible mechanism for the formation of compounds 2 and 3 is proposed. All new compounds were characterised by IR, NMR, mass spectral methods and elemental analysis.