1363380-86-2

2-Boc-3,4-dihydro-1H-pyrrolo-[1,2-a]pyrazine-6-carboxylic acid can be used to prepare tert-butyl (S)-6-((1-cyclohexyl-2-((5-(3,5-dimethylisoxazol-4-yl)pyridin-2-yl)amino)-2-oxoethyl)carbamoyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate by reacting with (S)-2-amino-2-cyclohexyl-N-(5-(3,5-dimethylisoxazol-4-yl)pyridin-2-yl)acetamide.