Ethyl Acetate → 5-Bromo-4-cyclopropyl-1(3H)-isobenzofuranone

Participants

Reaction Steps

To a cooled (0° C.) mixture of 5-bromo-4-vinyl-2-benzofuran-1(3H)-one (2.2 g, 9.21 mol) and Pd(OAc)2 (100 mg) in EtOAc (50 mL) was added a solution of CH2N2 in ether (100 mL) slowly. The resulting mixture was stirred at room temperature overnight, then quenched with acetic acid, filtered and the filtrate washed with water and brine, dried and concentrated to provide 5-bromo-4-cyclopropyl-2-benzofuran-1(3H)-one.

Provenance & Evidence