Issue 21, 2025

Total synthesis of (−)-griseocazine D2 and D3

Abstract

The first stereoselective total synthesis of (−)-griseocazine D2 and D3 is reported. (−)-Griseocazine D2 and D3 are multiprenylated pyrroloindoline-DKP alkaloids biogenetically related to several bioactive natural products. These alkaloids are neuroprotective agents as recently shown through a glutamate-induced excitotoxicity model by Pei-Yuan Qian et al. Structural challenges include a 7-annulated-ring system with 6 stereocenters among which two are all-carbon quaternary centers. Our concise and enantiospecific route accesses (−)-griseocazine D2 and D3 in four steps and 24% and 32% overall yields, respectively. L-Tryptophan is used as a common precursor for the regio- and stereoselective C3-isoprenylation step to afford complete diastereocontrol across the pyrroloindolines.

Graphical abstract: Total synthesis of (−)-griseocazine D2 and D3

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Article information

Article type
Communication
Submitted
22 Feb 2025
Accepted
02 Apr 2025
First published
15 Apr 2025

Org. Biomol. Chem., 2025,23, 5086-5090

Total synthesis of (−)-griseocazine D2 and D3

S. Pradhan and R. Viswanathan, Org. Biomol. Chem., 2025, 23, 5086 DOI: 10.1039/D5OB00320B

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