To a stirred solution of 1-(2-fluoro-4-iodophenyl)-3-(4-methoxybenzyl)-6,8-dimethyl-2,4,7-trioxo-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidin-5-yl 4-methylbenzene sulfonate (xxx) (2 gm, 2.79 mmol) in DMA (5 ml) was added 2,6-lutidine (0.597 g, 5.57 mmol) and 3-(3-aminophenyl)propanamide (intermediate xxvi) (0.915 gm, 5.57 mmole). The reaction mixture was heated at 130° C. for 16 h. The reaction mixture was cooled to room temperature and added water until a solid precipitate was obtained. The solid was filtered, washed with water and small amount of MeOH. The solid was purified by silica gel column chromatography, eluting with DCM:Methanol (9:1), to yield the titled compound (1b) (1.7 g) [m/z=710.20 (M+1)].
