Senanayake, Chris H.; Smith, George B.; Ryan, Kenneth M.; Fredenburgh, Laura E.; Liu, Ji; Roberts, F. Edward; Hughes, David L.; Larsen, Robert D.; Verhoeven, Thomas R.; Reider, Paul J.
Tetrahedron Letters, 1996 , vol. 37, # 19 p. 3271 - 3274

US5422351 A1, ;