Hj. Liu et Ks. Shia, DIELS-ALDER REACTIONS OF 2-BROMO-2-CYCLOALKENONES - A CONVENIENT APPROACH TO THE DOUBLY CISOID FULLY CONJUGATED DIENONE SYSTEM, Tetrahedron letters, 36(11), 1995, pp. 1817-1820
Under stannic chloride catalysis, 2-bromo-2-cycloalkenones 1 and 2 wer
e found to undergo Diels-Alder reaction with dienes to give adducts in
high yields. Subsequent treatment of the adducts with 1,8-diazabicycl
o[5,4.0]undec-7-ene gave the corresponding doubly cisoid fully conjuga
ted dienones.