作者:Daniele Passarella、Marisa Martinelli、Núria Llor、Mercedes Amat、Joan Bosch
DOI:10.1016/s0040-4020(99)00956-4
日期:1999.12
envisaged as a model synthetic equivalent of the dihydropyridinium cations A, which have been proposed as common biogenetic intermediates to both ngouniensine and Strychnos indole alkaloids. Lewis acid-promoted cyclization of the O-silyl ketene acetal derived from 9 led to the ngouniensine-type derivative 11.
2- Cyanotetrahydropyridine 9,轴承吲哚-2-乙酸乙酯部分,设想为模型合成的等效dihydropyridinium阳离子的甲,其已被提议作为共同中间体生物发生两者ngouniensine和马钱子吲哚生物碱。路易斯酸促进9衍生的O-甲硅烷基烯酮缩醛的环化反应,导致了壬烯胺型衍生物11。