Series of 5-phenoxy-2 (1H)-pyrimidinones, 5-phenoxy-4 (3H)-pyrimidinones, and related compounds were prepared in a follow-up of a lead prepared as a potential cyclic nucleotide regulating agent. Compounds were evaluated for bronchodilator activity in histamine- challenged guinea pigs and for antiulcer activity in a cold-restraint, stressed rat ulcer model. Bronchodilator activity comparable to, or greater than, that of theophylline was found in ...