Triphenylphosphine → (E)-4-(1,3-dihydro-6-methoxy-4-methoxyethoxymethoxy-7-methyl-3-oxoisobenzofuran-5-yl)-2-methylbut-2-enyl bromide

Participants

Reaction Steps

To a solution of (E)-4-(1,3-dihydro-6-methoxy-4-methoxyethoxymethoxy-7-methyl-3-oxoisobenzofuran-5-yl)-2-methylbut-2-en-1-ol (4.6 g) in methylene chloride (100 ml) at 0° C. was added triphenylphosphine (3.64 g) then N-bromosuccinimide (2.48 g). After 15 minutes the solution was washed with 10% aqueous sodium bisulphite, water, aqueous sodium bicarbonate, then dried and evaporated. The residue was chromatographed on silica gel, eluting with 4:1 hexane: ethyl acetate, to give (E)-4-(1,3-dihydro-6-methoxy-4-methoxyethoxymethoxy-7-methyl-3-oxoisobenzofuran-5-yl) -2-methylbut-2-enyl bromide, mp 74°-75° C. (hexane).

Provenance & Evidence