The stereoselective synthesis of vinylstannanes bearing car☐ylic acid function was achieved from acetylenic acids via stannylcupration reaction. In homoallylic series, regioselectivities are highly dependant on the nature of stannylanionids and on the protection of the car☐ylic acid function.
Stereoselective construction of conjugated trienoic acids was achieved through two successive Stille reactions, the first step consisting of the coupling of (E)-1,2-bis(tributylstannyl)ethene and tributylstannyl (Z)- or (E)-3-iodoalk-2-enoates. Two different routes were used for the second step: (1) cross-coupling of the stannyldienoic acid reagents and vinyl iodides, or (2) cross-coupling of vinylstannane