Nishikawa, Keisuke; Nakahara, Hiroshi; Shirokura, Yousuke; Nogata, Yasuyuki; Yoshimura, Erina; Umezawa, Taiki; Okino, Tatsufumi; Matsuda, Fuyuhiko Journal of Organic Chemistry, 2011, vol. 76, # 16 p. 6558 - 6573 doi: 10.1021/jo2008109