Stereoselective Synthesis of 2,4-Disubstituted Thiochromans Using the Supported Reagent System ‘Na2CO3/SiO2-PPA/SiO2’ - Aoyama, Tadashi; Okada, Kazuyuki; Nakajima, Hideaki; Matsumoto, Takuo; Takido, Toshio; Kodomari, Mitsuo (Synlett, 2007)