Tetrahedron Letters, , vol. 53, # 18 p. 2316 - 2318

Lakshman, Mahesh K.; Singh, Manish K.; Parrish, Damon; Balachandran, Raghavan; Day, Billy W.
Journal of Organic Chemistry, 2010 , vol. 75, # 8 p. 2461 - 2473

Mathe, Christophe; Lioux, Thierry; Gosselin, Gilles
Nucleosides, Nucleotides and Nucleic Acids, 2003 , vol. 22, # 5-8 p. 605 - 609