Synthesis of aspidospermidine alkaloids from 1,2,3,4-tetrahydrocarbazole: Total stereoselective synthesis of (±)-18-noraspidospermidine
作者:Anahí Urrutia、J.Gonzalo Rodríguez
DOI:10.1016/s0040-4020(99)00614-6
日期:1999.9
of the 1,2,3,4-tetrahydrocarbazol-4-one derivatives has been analysed and applied to the synthesis of (±)-18-noraspidospermidine (1b). This was synthesised, starting from 4-(1′,3′-dioxolan-2′-yl)cyclohexanone which was successively transformed to 3-methyl-3-(3′-nitropropyl)-1,2,3,4-tetrahydrocarbazol-4-one and to the imine tetracycle 13 by means of nickelboride catalyst. The reduction of 13 to the natural