Abstract
Palladium-catalysed hydrostannylation of alkynyl esters in benzene at room temperature gives regio- and stereoselectively (E)-α-stannyl-α,β-unsaturated esters in good yields. (E)-α-Stannyl-α,β-unsaturated ethyl esters are difunctional group reagents which undergo Stille coupling reactions with alkynyl bromides in the presence of Pd(PPh3)4 and Cul co-catalyst to afford stereoselectively (Z)-2-ethoxycarbonyl-substituted 1,3-enynes in good yields.
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