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A gold(i)-catalysed approach towards harmalidine an elusive alkaloid from Peganum harmala†
Solène Miaskiewicz,Jean-Marc Weibel,Patrick Pale,Aurélien Blanc
RSC Advances Pub Date : 09/21/2022 00:00:00 , DOI:10.1039/D2RA05685B
Abstract

Upon gold catalysis, the 2,3-dihydropyrrolo[1,2-a]indole motif, encountered in few but interesting bioactive natural products, was efficiently obtained from N-aryl 2-alkynylazetidine derivatives. In an attempt to apply this methodology to the synthesis of harmalidine, isolated from the seeds of Peganum harmala, advanced amino 2,3-hydropyrrolo[1,2-a]indol(one) derivatives were readily obtained in only 11 steps from but-3-yn-1-ol. While the reported structure of harmalidine could not be reached from these intermediates, a surprising 12-membered diimino dimer was isolated. Extensive comparison of the reported harmalidine NMR data to the experimental and calculated data of our synthetic molecules, harmaline or the synthetised N-methylharmaline show discrepancies with the proposed natural product structure.

Graphical abstract: A gold(i)-catalysed approach towards harmalidine an elusive alkaloid from Peganum harmala
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