tert-Butyl 4-(6-(6-bromo-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydro-pyrido(2,3-d)pyrimidin-2-ylamino)-pyridin-3-yl)-piperazine-1-carboxylate

It serves as a precursor for introducing the 6-acetyl group in the final API. Tert-butyl 4-(6-(6-bromo-8-cyclopentyl-5-methyl-7-oxo-7,8-dihydro-pyrido[3-d]pyrimidin-2-ylamino)-pyridin-3-yl)-piperazine-1-carboxylate is a crucial intermediate in the synthesis of Palbociclib, a selective CDK4/6 inhibitor used for breast cancer treatment.

API Name Palbociclib
CAS No 571188-82-4
Molecular Formula C27H34BrN7O3
Molecular Weight 584.5 g/mol
Synonyms tert-butyl 4-[6-[(6-bromo-8-cyclopentyl-5-methyl-7-oxopyrido[2,3-d]pyrimidin-2-yl)amino]-3-pyridinyl]piperazine-1-carboxylate