Dimethylformamide → rac-5-[6-[(tetrahydro-2H-pyran-2-yl)oxy]-1-hexynyl]-2H-1-benzopyran-2-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 1.47 g (5 mmol) of trifluoromethanesulfonic acid 2-oxo-2H-1-benzopyran-5-yl ester, 1.0 g (5.5 mmol) of rac-6-[(tetrahydro-2H-pyran-2-yl)oxy]-1-hexyne, 75 mg of cuprous iodide, 0.3 g (0.428 mmol) of dichlorobis(triphenylphosphine)palladium (II), 7.5 mL of triethylamine, and 35 mL of dry N,N-dimethylformamide was stirred and heated at 100° C. for 24 hr. The reaction mixture was cooled, poured into water, and worked-up with ether in the usual manner. The dark-brown, oily residue was flash chromatographed on silica gel. Elution with 2:1 hexane-ethyl acetate gave 1.09 g (67%) of rac-5-[6-[(tetrahydro-2H-pyran-2-yl)oxy]-1-hexynyl]-2H-1-benzopyran-2-one as an orange oil.

Provenance & Evidence