Abstract
The condensation reaction of a γ-tert-butylallenoate, ethyl 5,5-dimethylhexa-2,3-dienoate, and aldehydes in the presence of sodium ethoxide is described. A range of aldehydes readily reacts with γ-tert-butylallenoate and ethoxide providing a straightforward synthesis of 1,2,3,4-tetrasubstituted conjugated dienes in moderate to good yields and exclusive E,E selectivity. For some aldehydes, the condensation chemoselectively delivers conjugated enynes in good yields and exclusive E selectivity.
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