To a 10 mL microwave vial, was added (3aR,6aS)-tert-butyl 5-(6-(4-chloro-2-hydroxyphenyl)pyridazin-3-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate (0.182 g, 0.437 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate (0.385 g, 1.310 mmol), chloro[2-(dicyclohexylphosphino)-3,6-dimethoxy-2′,4′,6′-triisopropyl-1,1′-biphenyl][2-(2-aminoethyl)phenyl]palladium(II) (0.035 g, 0.044 mmol) and Cs2CO3 (0.427 g, 1.310 mmol), followed by adding 1,4-dioxane (2 mL) and water (0.5 mL). The reaction mixture was evacuated and filled with N2 twice then heated at 90° C. overnight. The reaction mixture was filtered through celite and washed with DMSO and MeOH. The filtrate was acidified with 1N HCl and stirred at RT for 3 hour, then extracted with DCM. The aqueous layer was basified with 2M NH2 in MeOH and a brownish precipitate formed, which was filtered and washed with DMSO to afford a grey solid 2-(6-((3aR,6aS)-hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)pyridazin-3-yl)-5-(1H-pyrazol-4-yl)phenol (82 mg, 0.224 mmol, 51.2% yield). MS (M+1)=349.1. The DMSO wash solution was concentrated to afford a DMSO solution of desired (3aR,6aS)-tert-butyl 5-(6-(2-hydroxy-4-(1H-pyrazol-4-yl)phenyl)pyridazin-3-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate (75 mg, 0.167 mmol, 38% yield), MS (M+1)=449.1, which was used directly in the next step.
