Diels-Alder reaction of 2,3-bis-(pinacolatoboryl)-l,3-butadiene: Facile preparation of 1,2-bis-(pinacolatoboryl)cyclohexenes and -1,4-cyclohexadiene
Diels-Alder reaction of 2,3-bis(pinacolato)boryl-l,3-butadiene with electron-deficient alkenes and dimethyl acetylenedicarboxylate proceeded smoothly upon heating, giving rise to the corresponding 1,2-diborylcyelohexenes in good to excellent yields. Conve