DFT Study on the Biosynthesis of Preasperterpenoid A: Role of Secondary Carbocations in the Carbocation Cascade.

DFT Study on the Biosynthesis of Preasperterpenoid A: Role of Secondary Carbocations in the Carbocation Cascade. Chem Pharm Bull (Tokyo). 2020;68(5):487-490 Authors: Sato H, Yamazaki M, Uchiyama M Abstract Preasperterpenoid A, featuring a 5/7/(3)6/5 pentacyclic structure, is a C25 sesterterpenoid produced by Penicillium verruculosum. The results of density functional calculations on putative biosynthetic carbocation cyclization/rearrangements leading to preasperterpenoid A revealed a highly concerted four-step cyclization mechanism. Interestingly, two secondary carbocation structures were obtained as minima, but appeared almost as shoulders in the energy profile, and may represent essentially transient structures during the highly concerted reaction. PMID: 32378547 [PubMed - in process]
Source: Chemical and Pharmaceutical Bulletin - Category: Drugs & Pharmacology Authors: Tags: Chem Pharm Bull (Tokyo) Source Type: research