Propargyl alcohol → HCID 11672832, compound

Participants

Reaction Steps

Pd(Ph3P)4 (116 mg, 2%), CuI (28 mg, 3%) and propargyl alcohol (0.9 ml, 15 mmol) are added successively to a solution of 3,4-dibromothiophene (1.18 g, 5.0 mmol) in n-propylamine (15 ml), and the reaction mixture is stirred at RT for 1 h and then under reflux for 7 h. More Pd(Ph3P)4 (58 mg, 1%), CuI (14 mg, 1.5%) and propargyl alcohol (0.45 ml, 7.5 mmol) are then added and the mixture is stirred under reflux for another 8 h. After cooling, the reaction mixture is filtered off through kieselguhr and washed with ethyl acetate (20 ml). The organic phase is concentrated under reduced pressure. Further purification is carried out by chromatography [Tol/Ac (8:2)] over a silica gel column. This gives the title compound (0.84 g) as a colorless solid. TLC, silica gel (glass plates), [toluene/acetone (8:2)], Rf=0.22.

Provenance & Evidence