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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Turbinatine, a potential key intermediate in the biosynthesis of corynanthean-type indole alkaloids
Carmen Lucia Cardoso1, Dulce Helena Siqueira Silva, Daniela Maria Tomazela
1Instituto de Química, Universidade Estadual Paulista, UNESP, CP 355, CEP 14-801-970, Araraquara, São Paulo, Brazil.
Abstract:
Extraction of the leaves of Chimarrhis turbinata has led to the isolation of turbinatine (1), a new corynanthean-type indole alkaloid, besides four known indole alkaloids, strictosidine, 5alpha-carboxystrictosidine, vallesiachotamine, and isovallesiachotamine. The structural determination of 1 was based on 1D and 2D spectroscopic data. An evaluation of the DNA-damaging activities of the isolates was performed by means of a bioassay using mutant strains of Saccharomyces cerevisiae, which indicated these compounds were weakly active.
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