Showing papers on "Indole alkaloid published in 1981"
38 citations
TL;DR: The total synthesis of the indole alkaloid 20-epiuleine has been achieved starting from indole itself and the appropriate 2-cyano Δ3 piperidine 7.
24 citations
TL;DR: Isorosibiline is a new indole alkaloid derived form desacetylisoretuline, having C-16 configuration inverted to that of rosibilines.
Abstract: From Strychnos floribunda stem bark extracts, the alkaloids bisnordihydrotoxiferine, akagerine, decussine, rouhamine, Strychnocarpine, desacetylisoretuline and isorosibiline were isolated as well as a mixture of the sterols beta-sitosterol, stigmasterol and campesterol. Isorosibiline is a new indole alkaloid derived form desacetylisoretuline, having C-16 configuration inverted to that of rosibiline.
18 citations
9 citations
01 Jan 1981
TL;DR: This chapter describes those alkaloids that contain two nuclei derived from tryptophan, and is organized approximately along the lines of a progressing biosynthetic pathway.
Abstract: Publisher Summary This chapter describes those alkaloids that contain two nuclei derived from tryptophan, and is organized approximately along the lines of a progressing biosynthetic pathway. Because of the divergence from previous organizational alignments, it appears necessary to mention the prior notations of some of the alkaloids and to indicate the volumes in this series in which certain of these alkaloids have been described. In the organization of this chapter, the simplest alkaloids derived from tryptophan are considered first. These are followed by a group formed from a monoterpenoid indole alkaloid and tryptophan, and finally by the groups formed by the union of two monoterpenoid indole alkaloid types arranged biogenetically.
7 citations
TL;DR: The isolation and structural determination of aristomakine (I), an unusual indole alkaloid with an N-isopropyl group, was reported in this paper.
7 citations
TL;DR: In this article, a new indole alkaloid of the leaves of Alstonia venenata R.Br., has been shown to possess the structure and absolute stereochemistry represented by 5b on the basis of spectral and chemical evidence.
7 citations
2 citations
01 Jan 1981
TL;DR: In this article, the indole alkaloid class eburnaminevincamine is defined and the absolute configurations of the alkaloids belonging to this series have been established and progress has been made in clarifying the relative and absolute stereochemistry of several.
Abstract: Publisher Summary The alkaloids eburnamine from Hunteria eburnea Pichon and vincamine from Vinca minor are the prototypes of the indole alkaloid class eburnaminevincamine. The alkaloids of this class are derivatives of ring skeletons of the same constitution. The absolute configurations of alkaloids belonging to this series have been established and progress has been made in clarifying the relative and absolute stereochemistry of several. NMR spectroscopy and mass spectrometry have proved useful tools in the structure analysis of certain eburnamine-vincamine alkaloids, although, yet, neither has been utilized extensively.
1 citations
1 citations