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Type: Artigo de periódico
Title: Enantioselective Total Syntheses Of (+)-arborescidine A, (-)-arborescidine B, And (-)-arborescidine C.
Author: Santos, Leonardo S
Pilli, Ronaldo A
Rawal, Viresh H
Abstract: Described are the first enantioselective total syntheses of (+)-arborescidine A ((+)-1), (-)-arborescidine B ((-)-2), and (-)-arborescidine C ((-)-3), via routes that proceeded in five steps and 50% overall yield, eight steps and 61% overall yield, and nine steps and 51% overall yield, respectively, from 6-bromotryptamine (7). The syntheses feature the use of the Noyori catalytic asymmetric hydrogen-transfer reaction to introduce chirality in dihydro-beta-carbolines 6 and 8. On the basis of an ample precedent from Noyori's work, the reduction produces dihydro-beta-carbolines, and ultimately the natural products, possessing the R absolute configuration. The synthetic arborescidines displayed optical rotations that were opposite in sign those of the natural products, thereby supporting the S configuration for natural arborescidines A (1) and B (2) and the (3S,17S) configuration for natural arborescidine C (3). Our results are in agreement with the initial stereochemical assignment by Païs and co-workers, and are counter to their recently revised assignment.
Subject: Alkaloids
Carbohydrate Conformation
Indole Alkaloids
Molecular Structure
Citation: The Journal Of Organic Chemistry. v. 69, n. 4, p. 1283-9, 2004-Feb.
Rights: fechado
Identifier DOI: 10.1021/jo035165f
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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