were formed via Pictet–Spengler condensation of cyclic tryptamine precursors. Oxidation of the indole 2-position of the precursors followed by condensation with aldehydes produced spiro-cyclic quinuclidines, containing important muscarine receptor pharmacophores.
The synthesis of new heterocyclic bridged ring systems. Analogs of tetrahydro-β-carbolines
作者:Christiaan Gremmen、Brigitte E.A. Burm、Martin J. Wanner、Gerrit-Jan Koomen
DOI:10.1016/s0040-4039(97)10823-1
日期:1998.3
New bridged β-carbolines were synthesized via a short synthetic route. The key step of the sequence is a Pictet-Spengler condensation under neutral conditions, employing a cyclic amine and several aldehydes. Using 5,5-diethoxypentanal gave a bridged analog which could be further ring closed to a new pentacyclic system.
Synthesis of the brominated marine alkaloids (±)-arborescidine A, B and C
作者:Brigitte E.A. Burm、Michaël M. Meijler、Jacco Korver、Martin J. Wanner、Gerrit-Jan Koomen
DOI:10.1016/s0040-4020(98)00306-8
日期:1998.5
brominated marinealkaloids arborescidine A (1), B (2) and C (3), starting from 6-bromo-(N-methyl) trypatamine is described. An equilibrium, under both basic and acidic conditions was found to exist between the trans- and cis-isomers 3 and 4. Spectral data indicated that the structure of isomer 4 does not correspond with the compound identified as arborescidine D recently isolated from the marine tunicate
Deoxynojirimycin derivatives and their uses as glucosylceramidase inhibitors
申请人:Universiteit van Amsterdam
公开号:US06177447B1
公开(公告)日:2001-01-23
Deoxynojirimycin derivatives containing a large hydrophobic moiety, such as cholesterol or adamantame-methanol, linked through a spacer, such as pentamethylene, to the nitrogen atom of deoxynojirimycin, and salts thereof, inhibit glucosylceramidase and may be useful in the treatment of diseases involving a ceramide-mediated signaling process, such as Gaucher disease.
In various conditions, dimerization of pentanedial-derived units gives rise to interesting skeletons, which are reminiscent of alkaloids known to be biosynthesized in Nature via lysine metabolism.