Synthesis of C-Nucleoside Analogues: 2-[2-(Hydroxymethyl)-1, 3-dioxolan-5-yl]1, 3-thiazole-4-carboxamide and 2-[2-(Mercaptometh-yl)-1, 3-dioxolan-5-yl]1, 3-thiazole-4-carboxamide