INFLUENCE OF LEWIS-ACIDS ON THE [4-CYCLOADDITION OF N,N'-FUMAROYLBIS[(2R)-BORNANE-10,2-SULTAM] TO CYCLOPENTADIENE AND APPLICATION TO VARIOUS DIENES(2])
T. Bauer et al., INFLUENCE OF LEWIS-ACIDS ON THE [4-CYCLOADDITION OF N,N'-FUMAROYLBIS[(2R)-BORNANE-10,2-SULTAM] TO CYCLOPENTADIENE AND APPLICATION TO VARIOUS DIENES(2]), Helvetica Chimica Acta, 81(2), 1998, pp. 324-329
Among seventeen different Lewis acids, TiCl4 was found to be the best
catalyst for the [4 + 2] cycloaddition of cyclopentadiene to N,N'-fuma
roylbis[(2R)-bornane-10,2-sultam] ((-).1). Independently of the TiCl4
molar concentration, almost constant and complete (98-89 % d.e.) diast
ereofacial pi-selection was achieved in the Diels-Alder addition of (-
).1 to cyclopentadiene, cyclohexadiene, isoprene, and 2,3-dimethylbuta
-1,3-diene.