Cesium carbonate → (S)-1-(4-(6-chloro-2-(3-methylmorpholino)pyrimidin-4-yl)phenyl)-3-ethylurea

Participants

Reaction Steps

(S)-4-(4,6-dichloropyrimidin-2-yl)-3-methylmorpholine (Intermediate 1B) (992 mg, 4.0 mmol), 4-(3-ethylureido)phenyl boronic acid pinacol ester (1.05 g, 3.6 mmol), cesium carbonate (3.9 g, 12.0 mmol) and bis(diphenylphosphino)-ferrocenedichloropalladium(II)-DCM-complex (163 mg, 0.2 mmol) in dioxane/water (1:3, 2.4 mL) were irradiated in a Biotage microwave for 40 min at 110° C. The reaction mixture was concentrated in vacuo, the residue suspended in water (150 mL) and the pH adjusted from 10 to 7 with HCl (2M aq solution). EtOAc (150 mL) was added and aqueous layer removed. The organic layer was washed with brine (70 mL) and then concentrated in vacuo to leave a brown solid which was purified by flash chromatography (0-5% MeOH in DCM over 30 min) to yield an orange solid, 630 mg, 42%.

Provenance & Evidence