Enantiospecific Total Syntheses of Nuphar Piperidine Alkaloids, (-)-Anhydronupharamine, (-)-Nupharamine, (-)-Nuphenine and (+)-3-Epinupharamine
摘要:
A concise enantiospecific synthesis of nuphar piperidine alkaloids was achieved by employing a regioselective carbon-carbon bond cleavage reaction of the cyclopentane derivative, having a gamma-chloro carbonyl system, as a key reaction.
A systematic investigation of radical haloacetal cyclizations (Ueno-Stork reaction) where the acetal center is the unique stereogenic element is reported. This highly diastereoselective reaction can be used for the preparation of polysubstituted tetrahydrofurans and gamma-lactones. We report herein the full experimental details of reactions where up to three new chiral centers are created. To demonstrate