Synthesis of (<i>E</i>)- and (<i>Z</i>)-1-Thiocyanatobuta-1,3-dienes and their Diels-Alder Reaction

1-Thiocyanatobuta-1,3-dienes react with strong dienophiles to produce directly the rearranged products of type (<b>6</b>) <i>via</i> a combination of a Diels-Alder reaction with a [3,3] sigmatropic shift.