Nicolaou; Qian, Wenyuan; Bernal, Federico; Uesaka, Noriaki; Pihko, Petri M.; Hinrichs, Jrgen Angewandte Chemie - International Edition, 2001, vol. 40, # 21 p. 4068 - 4071 doi: 10.1002/1521-3773(20011105)40:21<4068::AID-ANIE4068>3.0.CO;2-Y