Khan, Mohammad Ata-ullah; Ahmed, Zaheer, Synthetic Communications, 1987, vol. 17, # 12, p. 1459 - 1466
作者:Khan, Mohammad Ata-ullah、Ahmed, Zaheer
DOI:——
日期:——
General Approach for the Synthesis of Ajmaline/Sarpagine Indole Alkaloids: Enantiospecific Total Synthesis of (+)-Ajmaline, Alkaloid G, and Norsuaveoline via the Asymmetric Pictet−Spengler Reaction
enantiospecific fashion via the asymmetric Pictet−Spengler reaction and a stereocontrolled oxyanion-Cope rearrangement as key steps. The synthesis of these indole alkaloids employed a stereospecific Pictet−Spengler/Dieckmann protocol to prepare the key intermediate, (−)-Nb-benzyl tetracyclic ketone (7a or 7b). This ketone was converted into α,β-unsaturated aldehyde (8a or 8b) and further transformed into (+)-ajmaline