Disclosed herein are processes for preparing 8-(3-(4-acryloylpiperazin-l-yl)propyl)-6-(2,6-dichloro-3,5-dime thoxyphenyl)-2- (methylamino)pyrido[2,3-d]pyrimidin-7(8H)-one and FGFR inhibitor, as well as polymorphs and/or salt forms thereof.En este documento se divulgan procesos para preparar 8-(3-(4-acriloilpiperazin-1-il)propil)-6-(2,6-dicloro-3,5-dimetox ifenil)-2-(metilamino)pirido[2,3-d]pirimidin-7(8H)-onae inhibidor de FGFR, así como polimorfos y/o formas salinas de la misma.