Electrochemical oxidation of aspidofractinine-type indole alkaloids. A facile, electrochemically-mediated conversion of kopsingine to kopsidines A, B, C, and kopsinganol
作者:Guan-Huat Tan、Tuck-Meng Lim、Toh-Seok Kam
DOI:10.1016/0040-4039(94)02468-q
日期:1995.2
Kopsidine A, B, C and kopsinganol,were synthesised from kopsingine in good yields via the stable imminium salt obtained from electrochemical oxidation of kopsingine. Electrooxidation of dihydrokopsingine on the other hand gave the 17-to-5 and 17-to-3 oxo-bridged alkaloids directly, while 3-oxokopsingine was inert to electrooxidation in the potential range employed.