(16S)-Preakuammicine has been considered a key intermediate in the biosynthesis of monoterpene indole alkaloids since the 1970s. Indeed, preakuammicine plays a crucial role in the biosynthesis of type II and type III monoterpene indole alkaloids and strychnine. In this paper, we disclose the unprecedented biomimetic transformation of akuammiline into (16R)-acetylpreakuammicine, which ultimately gives
Total Syntheses of Echitamine, Akuammiline, Rhazicine, and Pseudoakuammigine
作者:Xiang Zhang、Badrinath N. Kakde、Rui Guo、Sonyabapu Yadav、Yucheng Gu、Ang Li
DOI:10.1002/anie.201901086
日期:2019.4.23
members of a fascinating class of monoterpenoid indole alkaloids. We report the syntheses of 2 and its congener deacetylakuammiline (3). The azabicyclo[3.3.1]nonane motif was assembled through silver‐catalyzed internal alkyne cyclization, and one‐pot C−O bond cleavage/C−N bond formation furnished the pentacyclic scaffold. Compound 3 then served as a common intermediate for preparing a series of structurally
Further alkaloidal constituents of the leaves of Rhazya stricta
作者:Yusuf Ahmad、Kaniz Fatima、Philip W. Le Quesne、Atta-ur-Rahman
DOI:10.1016/0031-9422(83)85045-6
日期:1983.1
Abstract Studies on the alkaloidal constituents of the leaves of Rhazyastricta have resulted in the isolation and structure elucidation of rhazimal (16-formylstrictamine), rhazimol (deacetylakuammiline), rhazinol (a hydroxymethyl analogue of strictamine). Two more new alkaloids stricticine and strictine have also been isolated.
Alstolenine, 19,20-dihydropolyneuridine and other minor alkaloids of the leaves of Alstonia venenata
作者:Priyalal Majumder、Ashoke Basu
DOI:10.1016/0031-9422(82)85212-6
日期:1982.1
Abstract Structures of alstolenine and 19,20-dihydropolyneuridine, two new indole alkaloids of the leaves of Alstoniavenenata have been established. In add