Acknowledgment. We thank Torey Silicone Co., Ltd., for a gift of chlorotrimethylsilane. The work was supported in part by the Ministry of Education, Science and Culture (Grants-in-Aid for Scientific Research), the Research Foundation for Pharmaceutical Sciences, the Houan-sha, the Takeda Science Foundation, the Yamada Science Foundation, and the Mitsubishi Foundation. ... Supplementary Material Available: Experimental and 'H NMH, IR, UV, and MS spectral data of 1, 3, and 4 ...