Takenaka, Kazuhiro; Tanigaki, Yugo; Patil, Mahesh L.; Rao, C. V. Laxman; Takizawa, Shinobu; Suzuki, Takeyuki; Sasai, Hiroaki Tetrahedron Asymmetry, 2010 , vol. 21, # 7 p. 767 - 770