1. Department of Chemistry and Research Center for Materials Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan, Kinjo Gakuin University, Omori, Moriyama, Nagoya 463-8521, Japan, and Medicinal Chemistry Laboratories, Pharmaceutical Research Division, Takeda Chemical Industries, Ltd., 2-17-85 Juso-honmachi, Yodogawa, Osaka 532-8686, Japan