Abstract
A continued effort to synthesis of functionalized ABEF tetracyclic ring system of structurally complex C20-diterpenoid alkaloid racemulosine from previously reported tetracyclic aziridine intermediate 3 was described. The synthesis features a regio- and stereoselective ring opening of aziridine and a challenging free radical cyclization reaction to construct functionalized ring B, which could provide a good basis for total synthesis of racemulosine.
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