Plaunotol (1), a known antiulcer drug, is the most important component of the Thai folk medicinal plant, Plau-noi, which has remarkable antipeptic ulcer activity. Recently, it was found that plaunotol (1) has antibacterial activity against Helicobacter pylori, a causative agent in gastric ulcers and gastric adenocarcinoma, for example. In our investigation of the practical synthesis of 1, we have developed an efficient method for stereoselective ...