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Pyrrolidinoindoline Alkaloids from Psychotria colorata1
1Dipartimento di Chimica Organica e Industriale, Università degli Studi, via Venezian 21, 20133 Milano, Italy, Centro per lo Studio delle Relazioni tra Struttura e Reattività Chimica del CNR, via Golgi 19, 20133 Milano, Italy, Structure Based Drug Design, Pharmacia & Upjohn, via Pasteur 10, 20014 Nerviano (MI), Italy, Departamento de Farmacologia, Universidade Federal do Rio Grande do Sul, CP 5072, Porto Alegre (RS), Brazil, and Curso de Pós-Graduação en Química, Universidade Federal do Parà, Belém (PA), Brazil.
Abstract:
Fractionation of an alkaloid extract of Psychotria colorata flowers led to the isolation of six alkaloids, identified by UV, 1D and 2D NMR, and MS as (-)-calycanthine, isocalycanthine, (+)-chimonanthine, hodgkinsine, quadrigemine C, and a new alkaloid (1), whose structure was deduced by X-ray analysis to be (8-8a),(8'-8'a)-tetradehydroisocalycanthine 3a(R), 3'a(R).