摘要:
[GRAPHICS]Treatment of a (2-azaallyl)stannane with HF . pyridine generated a nonstabilized N-unsubstituted azomethine ylide, which was found to undergo an efficient and stereoselective dipolar cycloaddition with phenyl vinyl sulfone to produce a trans 2,5-dialkylpyrrolidine that was further transformed into the dendrobatid alkaloid indolizidine 239CD.