Acetaldehyde → Ethyl 4-methyl-5-(6-methyl-3,6-dihydro-2H-pyran-2-yl)isoxazole-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl 5-(1-hydroxybut-3-en-1-yl)-4-methylisoxazole-3-carboxylate (35 mg, 0.155 mmol) in DCM (1 mL) was treated with acetaldehyde (8.72 μl, 0.155 mmol) and the reaction mixture was cooled to 0° C. A solution of TMSOTf (80.4 μL, 0.465 mmol) in DCM (1.5 mL) cooled to 0° C. was added and the reaction mixture was stirred at 0° C. for 30 minutes and at room temperature overnight. To the resulting mixture was added a saturated solution of ammonium chloride (aq) (2 mL) and this was extracted with DCM (×3). The combined organic extracts were passed through a phase separating cartridge and the eluent was concentrated under reduced pressure. The crude material was adsorbed onto silica and purification by chromatography eluting with 0-100% EtOAc in iso-hexane afforded the title compound;

Provenance & Evidence