Nicolaou; Safina, Brian S.; Funke, Christian; Zak, Mark; Zecri, Frederic J. Angewandte Chemie - International Edition, 2002, vol. 41, # 11 p. 1937 - 1940 doi: 10.1002/1521-3773(20020603)41:11<1937::AID-ANIE1937>3.0.CO;2-Y