for the following products
6-Bromo-8-cyclopentyl-2-[[5-(4-Boc-1-piperazinyl)-2-pyridyl]amino]-5-methylpyrido[2,3-d]pyrimidin-7(8H)-one | tert-butyl 4-{6-[(6-bromo-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-2-yl)amino]pyridin-3-yl}piperazine-1-carboxylate and 4-[6-[(6-Bromo-8-cyclopentyl-7,8-dihydro-5-methyl-7-oxopyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl]-1-piperazinecarboxylic acid 1,1-dimethylethyl ester
