4-Toluenesulfonyl chloride → HCID 22320763, compound

Participants

Reaction Steps

5-(4-Chlorophenyl)pent-4-yn-1-ol (35.7 g, 182 mmol), 4-dimetylamino-pyridine (8.9 g, 73 mmol), p-toluenesulfonyl chloride (34.7 g, 182 mmol), and 62 ml of triethylamine were combined in 330 ml of dichloromethane at 0° C. The mixture was stirred for 30 min. at 0° then 18 hours at room temperature. Dilution with 200 ml of dichloromethane followed by washing with brine, drying over magnesium sulfate, filtration through silica gel with hexane-ethyl acetate, 8:1, gave a yellow solid on evaporation. Crystallization from ether gave 5-(4-Chlorophenyl)pent-4-yn-1-ol p-toluenesulfonate as colorless crystals (31.7 g, 49% yield). This was converted to the title compound by reaction with sodium iodide in acetone, and was used in subsequent reactions with no further purification; MS m/z 303.9 (M+ calcd. for C11H10Cll=304.6).

Provenance & Evidence