Ramulu, Udugu; Ramesh, Dasari; Reddy, Sudina Purushotham; Rajaram, Singanaboina; Babu, Katragadda Suresh Tetrahedron Asymmetry, 2014, vol. 25, # 20-21 p. 1409 - 1417 doi: 10.1016/j.tetasy.2014.09.009