synthesis of 3-Amino-5-fluoropyridine: A solution of 3-amino-2,4,6-tribromo-5-fluoropyridine (23c) (0.9 g, 2.6 mmol), triethylamine (1.1 cm3, 7.9 mmol), palladium catalyst (0.1 g of 5% Pd-C catalyst) and DCM (15 cm3) was hydrogenated on a Parr apparatus for 18 h. Water (20 cm3) was added and the mixture filtered and extracted into DCM. The DCM solution was dried (MgS04) and evaporated giving 3-amino-5-fluoropyridine (0.3 g, >95% ), m.p. 86 ·c (from DCM) (Found: C, 53.6; H, 4.6; N, 25.0. C5H5FN2 requires C, 53.6; H, 4.5 N, 25.0%);
IR spectrum no. 9; mass spectrum no. 5; nmr spectrum no. 29.
