Aspidosperma alkaloids cyclization of secodine intermediate: Synthesis of (±)-3-oxovincadifformine ethyl ester.
作者:Bruno Danieli、Giordano Lesma、Giovanni Palmisano、Daniele Passarella、Alessandra Silvani
DOI:10.1016/s0040-4020(01)81347-8
日期:1994.1
(+/-)-3-oxovincadifformine ethyl ester 14 has been synthesized through an intramolecular [4 pi+2 pi] cycloaddition of the 3-oxosecodine 13 first prepared in turn from the enamide 10 by dehydrogenation with benzeneseleninic anhydride. An insight into the conversion of 10 into 13 was gained, resulting in the suggestion of a plausible mechanistic pathway.
(±)-3-氧代春雷霉素乙酯(14)是通过3-氧代二氢吲哚(13)的分子内[4π+2π]环加成反应合成的,而3-氧代二氢吲哚(13)则是依次从烯酰胺(10)经由苯硒酸酐脱氢制备得到。研究了10到13的转化过程,从而提出了一个合理的机理 pathways。