Water → (S)-(4-Chloro-phenyl)-[1-(4,6-dimethyl-1,2-benzisothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-acetic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-(4-Chloro-phenyl)-(2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl)-acetic acid ethyl ester (50 mg, 0.14 mmol) (prepared according to example 1, steps 1-3) in DMF (10 mL) are added 3-Bromomethyl-4,6-dimethyl-1,2-benzisothiazole (54 mg, 0.21 mmol) (prepares according to example 5, steps 1-6) and K2CO3 (58 mg, 0.42 mmol) at room temperature under nitrogen atmosphere. The solution is heated to 100° C. for 2 hours. The solution is cooled down and water is added. The solution is extracted with EtOAc and the combined organic layer is dried with MgSO4. The solution is filtered and the filtrate is concentrated. The residue is purified by flash chromatography with 20% EtOAc in Hexane as the eluent to afford (S)-(4-Chloro-phenyl)-[1-(4,6-dimethyl-1,2-benzisothiazol-3-ylmethyl)-2,4-dioxo-1,4-dihydro-2H-quinazolin-3-yl]-acetic acid ethyl ester (50 mg, 67%) as a colorless foam.

Provenance & Evidence