Total synthesis of (±)-villosin C and (±)-teuvincenone B
文献情報
Hong-Yan Shen, Xu-Dong Mao
Herein, we report the first total synthesis of 17(15 → 16)-abeo-abietane diterpenoids (±)-villosin C (5) and (±)-teuvincenone B (4) in 11 steps. The A/B/C ring system was assembled via a modified three-step sequence on gram-scale, while the D ring was constructed by intramolecular iodoetherification. This synthesis relied largely on the rational design of the order for oxidation state escalation (C6/11/14 → C7 → C12 → C17), which was realized through sequential benzylic iodination/Kornblum oxidation, Siegel–Tomkinson C–H oxidation and iodoetherification. In addition, villosin C (5) and its epimer (5a) were found to have indistinguishable NMR data and the correct configuration for villosin C was elucidated by comparing HPLC trace with a natural sample.
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Organic Chemistry Frontiers publishes high-quality research from across organic chemistry. Emphases are placed on studies that make significant contributions to the field of organic chemistry by reporting either new or significantly improved protocols or methodologies. Topics include, but are not limited to the following: Organic synthesis Development of synthetic methodologies Catalysis Natural products Functional organic materials Supramolecular and macromolecular chemistry Physical and computational organic chemistry










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