5-Bromophthalide → 5-[1,3]dioxolan-2-ylmethyl-3H-isobenzofuran-1-one

Participants

Reaction Conditions

Reaction Steps

A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 470 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.03 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 hours, checked by HPLC-MS, then stirred at 85° C. for 5 more hours. The mixture was then allowed to return to RT for overnight. 2-MethylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in DCM to afford the title compound. LC-MS (IE, m/z): 221 [M+1]+.

Provenance & Evidence