Morpholine → 1-isopropyl-6-morpholino-1H-indazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

In a 25 mL sealable tube under nitrogen were combined methyl 6-bromo-1-(1-methylethyl)-1H-indazole-4-carboxylate (250 mg, 0.84 mmol), sodium tert-butoxide (178 mg, 1.85 mmol), Pd-XPhos precatalyst (chloro(2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl)[2-(2-aminoethyl)phenyl]Pd(II); Me-t-butylether adduct) (34.8 mg, 0.042 mmol) and morpholine (81 mg, 0.93 mmol) in Dioxane (4 mL). The resulting mixture was degassed with nitrogen for 10 minutes. The vessel was sealed and the mixture was heated at 98° C. for 20 hours. The contents were diluted with water and 1N HCl was added to adjust the pH˜3-4. The contents were extracted with EtOAc and DCM/isopropanol (8:2), and the combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated. The residue was dissolved in DCM and purified by SiO2 chromatography (eluent: Hexanes/EtOAc gradient 0 to 100% EtOAc). Fractions were evaporated and solids were dried to afford the title compound as a light yellow solid (115 mg, 46%). LC-MS (ES) m/z=290.2. 1H NMR (400 MHz, DMSO-d6) δ ppm 13.13 (br. s., 1H) 8.18 (s, 1H) 7.56 (d, J=2.02 Hz, 1H) 7.26-7.29 (m, 1H) 5.00 (quin, J=6.57 Hz, 1H) 3.77-3.81 (m, 4H) 3.22-3.26 (m, 4H) 1.46 (s, 3H) 1.44 (s, 3H)

Provenance & Evidence