Organoboron compounds are nowadays extensively used in organic synthesis.[1] Besides the cross-coupling reactions, alkenyl and dienyl boronic acids participate in Diels–Alder reactions leading to boron containing adducts, which can be easily transformed into highly functionalized systems. Dialkoxyboryl 1, 3-butadiene derivatives, with the borate ester at C2 [2] and C1,[3] have been reported to react with typical dienophiles and heterodienophiles,[ ...
