A Non-Photochemical Approach to the Bicyclo[3.2.0]heptane Core of Bielschowskysin
摘要:
An asymmetric synthesis of the tricyclic core (-)-1 of the marine diterpene bielschowskysin is described. In particular, a methodology was developed to introduce the crucial quaternary center at C-12.
Light-Mediated Total Synthesis of 17-Deoxyprovidencin
摘要:
AbstractAn asymmetric synthesis of the diterpenoid 17‐deoxyprovidencin is described. Key steps include an aldol addition, a base‐catalyzed Wipf‐type furan formation, a Z‐selective ring‐closing metathesis for macrocyclization, a photochemical E/Z isomerization to a highly strained and conformationally restricted ring system, and the stereoselective formation of two epoxides on the ring.
Jatrophanediterpenes are structurally intriguing natural products with promising biological properties. Herein, the synthesis of the westernfragment of the Euphorbiaceae constituent Pl-3 starting from (1R,5S)-bicyclo[3.2.0]hept-2-en-6-one is described. Key steps in the sequence include a Baeyer–Villiger oxidation, an iodolactonization reaction, and the installation of the northern side chain through