... Chem. 1987, 30, 1054. 0022-2623/87/1830-1497$01.50/0 0 1987 American Chemical Society Page 2. 1498 Journal of Medicinal Chemistry, 1987, Vol. 30, No. 8 Scheme I Notes i Ill IV Method A R,-CO-CH, - R,-CO-CH,Br I (3_2-3_7) iv viii Method B R,H -t VI ...