Triethylamine → 2-formyl-3-methyl-5-(tetrahydro-2H-pyran-2-yloxy)phenyl trifluoromethanesulfonate

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Reaction Conditions

Reaction Steps

Into a 50-mL 3-necked round-bottom flask, purged and maintained with an inert atmosphere of nitrogen, were placed a solution of 2-hydroxy-6-methyl-4-(tetrahydro-2H-pyran-2-yloxy)benzaldehyde (300 mg, 1.27 mmol, 1.00 equiv) in dichloromethane (20 mL) and triethylamine (510 mg, 5.05 mmol, 3.97 equiv). This was followed by the addition of a solution of Tf2O (720 mg, 2.55 mmol, 2.01 equiv) in dichloromethane (5 mL) dropwise with stirring at −78° C. The resulting solution was stirred for 2 h at −78° C., then quenched by the addition of 5 mL of water. The resulting solution was extracted with 3×30 mL of dichloromethane. The organic layers were combined, washed with 3×10 mL of brine, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column and eluted with ethyl acetate/petroleum ether (1:10). This resulted in 110 mg (19%) of 2-formyl-3-methyl-5-(tetrahydro-2H-pyran-2-yloxy)phenyl trifluoromethanesulfonate as a yellow oil.

Provenance & Evidence