Formal Total Synthesis of (-)-Dendrobine Using Zirconium-Promoted Reductive Cyclization
摘要:
The alkaloid (-)-dendrobine was synthesized from (+)-calvone by a short sequence using zirconium-promoted reductive cyclization. The absolute configuration of a synthetic intermediate was determined by an improved version of Mosher's method.
Formal Total Synthesis of (-)-Dendrobine Using Zirconium-Promoted Reductive Cyclization
摘要:
The alkaloid (-)-dendrobine was synthesized from (+)-calvone by a short sequence using zirconium-promoted reductive cyclization. The absolute configuration of a synthetic intermediate was determined by an improved version of Mosher's method.
An organocatalytic cross-coupling of allyl bromides and arylboronicacids was developed using a designer thioether catalyst. Preliminary mechanistic studies suggested the involvement of a key sulfoxonium ylide that binds to the arylboronicacid and triggers 1,2-aryl migration.