Mulzer, Johann; Oehler, Elisabeth; Enev, Valentin S.; Hanbauer, Martin Advanced Synthesis and Catalysis, 2002, vol. 344, # 6-7 p. 573 - 584 doi: 10.1002/1615-4169(200208)344:6/7<573::AID-ADSC573>3.0.CO;2-C