反应详情

The procedure for the preparation of [2-(3-cyclopropyl-2,4-dioxo-3,4-dihydro-2H-quinazolin-1-ylmethyl)-1-(3-methyl-butyl)-1H-benzoimidazol-5-ylmethyl]-carbamic acid tert-butyl ester was followed starting with 3-vinyl-1H-indazole (140 mg, 0.970 mmol) and 2,2-dimethyl-propionic acid 4-[5-(tert-butoxycarbonylamino-methyl)-2-chloromethyl-benzoimidazol-1-yl]-butyl ester; HCl salt (474 mg, 0.614 mmol). After quenching with water, a gum formed. The water was decanted and the residue partitioned between diethyl ether and water. The layers were separated and the aqueous phase extracted with diethyl ether (2×40 mL). The combined organic phases were washed with water (twice), brine, and dried (MgSO4). Purification by flash chromatography (eluent hexane-acetone 2:3) afforded 2,2-dimethyl-propionic acid 4-[5-(tert-butoxycarbonylamino-methyl)-2-(3-vinyl-indazol-1-ylmethyl)-benzoimidazol-1-yl]-butyl ester (386 mg, 71%) as a colorless foam:

1. customAfter quenching with water
2. customa gum formed
3. customThe water was decanted
4. customthe residue partitioned between diethyl ether and water
5. customThe layers were separated
6. extractionthe aqueous phase extracted with diethyl ether (2×40 mL)
7. washThe combined organic phases were washed with water (twice), brine
8. dry with materialdried (MgSO4)
9. customPurification by flash chromatography (eluent hexane-acetone 2:3)