Sodium Carbonate → HCID 66668197, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl 4-(2-(3-bromophenyl)-5-oxo-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-yl)piperazine-1-carboxylate (40 mg, 0.081 mmol, 1.0 equiv) in 1 mL DMF, 0.5 mL ethanol and 0.25 mL water in a microwave vial is added 4-pyridineboronic acid (19.97 mg, 0.162 mmol, 2.0 equiv), sodium carbonate (25.8 mg, 0.244 mmol, 3.0 equiv), and tetrakis(triphenylphosphine)palladium(0) (4.69 mg, 4.06 μmol, 0.05 equiv). The mixture is heated in a microwave reactor for 30 min at 120° C. Upon completion the mixture is filtered through a thiol-SPE column (Stratospheres) and the resulting solution is concentrated in vacuo to give crude tert-butyl 4-(5-oxo-2-(3-(pyridin-4-yl)phenyl)-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-7-yl)piperazine-1-carboxylate as a yellow oil. The residue is then taken on crude to the next reaction, which follows the same deprotection procedure as described in Step 3 of Example 1 to give 7-(piperazin-1-yl)-2-(3-(pyridin-4-yl)phenyl)-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one (12 mg, 38%) as a tan solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.67 (dd, J=4.30, 1.57 Hz, 2H), 8.18 (s, 1H), 8.02 (dd, J=16.43, 8.22 Hz, 2H), 7.70-7.82 (m, 3H), 5.40 (s, 1H), 3.42-3.51 (m, 4H), 2.68-2.75 (m, 4H); LCMS: (electrospray+ve), m/z 391.1 (MH)+; HPLC: tR=2.82 min, UV254=100%. HRMS (ESI): m/z calcd for C20H19N6OS [M+H]+391.1321. found 391.1322.

Provenance & Evidence