Syntheses of 5, 5′-Disubstituted 2, 2′-Bipyridines
C Janiak, S Deblon, HP Wu
Index: Janiak, Christoph; Deblon, Stephan; Wu, He-Ping Synthetic Communications, 1999 , vol. 29, # 19 p. 3341 - 3352
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Citation Number: 17
Abstract
Abstract New and improved syntheses of 5, 5′-donor-functionalized 2, 2′-bipyridines are reported with the 5, 5′-donors being-NH2 (4),-NMe2 (5),-CN (6), and-NCS (7). A new route for 4 and 5 is based on the coupling of 2-chloro-5-amino-pyridine in the presence of NiCl2· 6 H2O/PPh3/Zn in DMF (NiCRA). 6 was obtained by a dehydration treatment of 5, 5′- dicarboxamide-2, 2′-bipyridine with (F3CO) 2O and P4O10. The new ligand 7 is ...
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