The palladium-catalyzed silylstannylation of 4-(phenylselanyl)but-1-yne proceeded
regio- and stereoselectively, followed by selenoxide elimination via oxidation to
give (Z)-1-(trimethylsilyl)-2-(tributylstannyl)buta-1,3-diene in good yield. This conjugated
diene underwent the Stille coupling reaction with various aryl iodides in the presence
of Pd(PPh3)4 to afford (Z)-2-aryl-1-(trimethylsilyl)buta-1,3-dienes with high stereoselectivity. Reversing
the order of selenoxide elimination and Stille coupling reaction in the synthetic
procedure also resulted in good yields of (Z)-2-aryl-1-(trimethylsilyl)buta-1,3-dienes.
Key words
silylstannylation - selenide - Stille coupling reaction - selenoxide elimination -
conjugated dienes - stereoselectivity