60. Gebul-t\lng gcwidmet Q3.III. 77)AIstoniu scholaris: The structure of the indole alkaloid nareline SummaryBesides the known akuammidine, picralinal, picrinine and pseudoakuammigine a new indole alkaloid called nareline ( M = 352) was isolated from A lstonia scholaris R. BR., which belongs to the plant family of Apocynaceae. Its structure 2 was deduced by single crystal X-ray diffraction. 2 represents the absolute configuration. The spectroscopic data of 2 and its derivatives (Scheme 1) as well as their chemical behavior support this structure. In biogenetic sense nareline is related to the bases akuammiline (4) and picraline (5) (Scheme 2). In contrast to those the C-atom 5 is exocyclic and represents an aldehyde group which forms together with the oxygen atom of the N(4)-hydroxylamine group a cyclic half acetale. -By oxidation (CrO,/ CH,COOH) of 2 the oxindol derivative 19 (oxonareline) is formed which contains a cyclic acetal as a partial structure element (Scheme 4). Alstonia scholaris R. BR. ist eine in Indien beheimatete

No abstract

No abstract

No abstract

Phytochemical investigation of the gum resin of Ferula assafoetida resulted in the isolation and characterization of a new sesquiterpenoid coumarin, Saradaferin (1) named as [Decahydro-(3-alpha-hydroxy-4,4,10-trimethyl-8-methylene-9-naphthenyl)-alpha-hydroxymethyl] ether of umbelliferone.

No abstract

No abstract

No abstract