Thorave, Amol A.; Prajapati, Pinkal N.; Pethani, Jignesh P.; Kothari, Krunal C.; Jain, Mukul R.; Patel, Pankaj R.; Kharul, Rajendra K. Tetrahedron Letters, 2009 , vol. 50, # 40 p. 5660 - 5663