BY RON MAGOLDA
Medical Products Department
E.I. du Pont de Nemours & Co.
" A new and general route to pyridones is reported via an Aza-Robinson annulation.
F.G. Fang, M. Prato, G. Kim, S.J. Danishefsky, “The Aza-Robinson annulation: an application to the synthesis of ISO-A58365A,” Tetrahedron Letters, 30, 3625-8, 1989. (Yale University, New Haven, Conn.)
An exceptionally mild, efficient, and safe intramolecular method for the preparation of cyclopropanes through iodonium ylides is described.
R.M. Moriarty, 0. Prakash, R.K. Vaid, L. Thao, “A novel intramolecular cyclopropanation using iodonium ylides,” Journal of the American Chemical Society (JACS), 111, 6443-4, 2 August 1989.’(University of Illinois,. Chicago)
" Radical cyclization of properly substituted sugars has extended the chiral pool for synthetic endeavors. A recent communication offers several operational and synthetic advantages over the current procedures.
E.J. Enholm, A. Trivellas, “Samarium(ll) iodide mediated transformation of carbohydrates to carbocycles,”JACS...