Christoffers, Jens; Oertling, Heiko; Fischer, Peter; Frey, Wolfgang Synlett, 2002 , # 6 p. 957 - 961 Title/Abstract Full Text View citing articles Show Details Christoffers, Jens; Oertling, Heiko; Fischer, Peter; Frey, Wolfgang Tetrahedron, 2003 , vol. 59, # 21 p. 3769 - 3778