tert-Butyl carbamate → N-[5-amino-4-methoxy-2-(4-methyl-1-piperazinyl)phenyl]carbamic acid 1,1-dimethylethyl ester

Temperature

120 °C

To a suspension of 5-bromo-2-methoxy-4-(4-methylpiperazin-1-yl)aniline (50 mg, 0.17 mmol) in dioxane (4 mL) was added tert-butyl carbamate (24.39 mg, 0.21 mmol), cesium carbonate (81 mg, 0.25 mmol) and 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (19.27 mg, 0.03 mmol). The resulting suspension was degassed and Palladium(II) acetate (3.74 mg, 0.02 mmol) was added. The mixture was degassed and stirred at 120 °C for 2 hours in the CEM microwave, then allowed to cool to ambient temperature. The reaction was incomplete so further cesium carbonate (81 mg, 0.25 mmol), 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (19.27 mg, 0.03 mmol) and diacetoxyzinc (30.6 mg, 0.17 mmol) were added and the mixture was degassed. Further Palladium(II) acetate (3.74 mg, 0.02 mmol) was added, and the mixture was degassed and stirred at 130 °C for 1 hour in the CEM microwave, then allowed to cool to amibient temperature. TLC (10% MeOH in DCM + 1% cNH3 (aq)) suggests bromo SM has been consumed but no evidence of desired product having been formed. UPLC shows only oxidised xantphos. Reaction stopped

ORD record

ord-4ae237ba7d264026afd182c3af660100

Source dataset

750 AstraZeneca ELN dataset

Original link

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