Ge. Keck et D. Krishnamurthy, A SIMPLE AND PRACTICAL SYNTHESIS OF (-2-BROMOBICYCLO [2.2.1]HEPT-5-ENE-2-CARBOXALDEHYDE VIA CHIRAL LEWIS-ACID CATALYZED [4+2] CYCLOADDITION()), Synthetic communications, 26(2), 1996, pp. 367-373
A chiral titanium complex derived from BINOL and Ti(O-i-Pr)(4) catalyz
es the Diels-Alder reaction of 2-bromoacrolein and cyclopentadiene wit
h 97:3 enantioselectivity. Lower enantioselectivity was observed using
other dienes or with methacrolein as dienophile.