Scheme 3. Reagents and Conditions: (a) NaH (60% Dispersion in Mineral Oil), 0 °C, DMF and Then 4 h, rt; (b) Anhydrous CH₂Cl₂/TFA (8:2, v/v, 20 mL), rt, 1 h; (c) ACy (i–iv and vii–viii), TBTU (1.1 equiv), HOBt (1.1 equiv), DIPEA, DMF, Overnight, rt; and (d) (1) SOCl₂ (10 equiv), Anhydrous CH₂Cl₂, Reflux, 1 h and (2) ACy (v and vi, 2 equiv), Anhydrous Tetrahydrofuran, Overnight, rt.