A Stereoselective Access to Functional Dienes Containing a Trifluoromethyl Group <i>via</i> Stille Cross Coupling of Ethyl 4,4,4-Trifluoro-3-iodobutenoate
Stereoselective construction of 3-trifluoromethyl conjugated dienoates or enynoates was achieved from ethyl (Z)-4,4,4-trifluoro-3-iodobutenoate and alkenyltin or alkynyltin reagents through the Stille reaction. Reduction of ethyl 3-trifluoromethyldienoates using DIBAL-H selectively afforded allylic alcohols.
Stereoselective construction of 3-trifluoromethyl conjugated dienoates, trienoates or dienynoates was achieved from ethyl (Z)-4,4,4-trifluoro-3-iodobutenoate and alkenyltin or alkynyltin reagents through the Stille reaction or under HeckâSonogashira coupling conditions. Reduction of ethyl 3-trifluoromethyldienoates using DIBAL-H selectively yielded allylic alcohols and hydrolysis with lithium hydroxide yielded the corresponding acids.