The First Synthesis of (−)-Asperpentyn and Efficient Syntheses of (+)-Harveynone, (+)-Epiepoformin and (−)-Theobroxide
摘要:
A generally applicable strategy for the synthesis of a range of polyoxygenated cyclohexane natural products has been developed. The enantioselective syntheses of (-)-theobroxide, a polyoxygenated cyclohexane natural compound with potent growth inducing properties in potato microtubers has been achieved via a 1,2 O-silyl migration between trans-hydroxyl groups and a remote hydroxyl directed epoxidation of an enone derived from quinic acid. A thus derived alpha -iodoenone was subjected to Stille coupling with tetramethylstannane to afford the first title compound. A similar strategy enabled a route to the complete asymmetric synthesis of the acetylenic phytotoxin (+)-harveynone. By selective reduction of (-)-theobroxide, (+)-epiepoformin was also prepared in enantiopure form and similarly, stereoselective reduction of (+)-harveynone completed the first enantioselective synthesis of (-)-asperpentyn, another natural compound with antimicrobial activity.
Short Synthesis of (+)‐Actinobolin: Simple Entry to Complex Small‐Molecule Inhibitors of Protein Synthesis
作者:Prabhakara R. Tharra、Andrey A. Mikhaylov、Jiří Švejkar、Marina Gysin、Sven N. Hobbie、Jakub Švenda
DOI:10.1002/anie.202116520
日期:2022.4.19
Bactobolins are complex inhibitors of protein synthesis that target a novel site of the bacterial ribosome. A simple synthetic process by which (−)-quinic acid, L-threonine and L-alanine are combined to yield (+)-actinobolin is reported. The modularity of the approach unlocks new possibilities in analog synthesis.