Efficient Synthesis of Imidazo[2,1-b][1,3]benzothiazoles and 9H-Imidazo-[1,2-a][1,3]benzimidazoles under Solvent-Free Conditions - Adib, Mehdi; Sheibani, Esmail; Zhu, Long-Guan; Bijanzadeh, Hamid Reza (Synlett, 2008)