Acetic acid, 2-(triphenylphosphoranylidene)-, methyl ester → HCID 66855715, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 2-isopropoxy-N-methoxy-N-methyl-4-trifluoromethyl-benzamide (28 mg, 0.096 mmol) in THF (1.5 mL) was added dropwise 1.0M LiAlH4 (0.048 ml, 0.5 eq) at −60° C. The mixture was slowly warmed up to −20° C. until the reaction was completed. The reaction was slowly quenched with sat'd KHSO4 (1 mL) and then diluted with water (1 mL). The reaction mixture was extracted with ether and the combined organic layer was dried over anhydrous MgSO4, filtered and concentrated under reduced pressure. The resulting compound was vacuum dried to yield the 2-isopropoxy-4-trifluoromethyl-benzaldehyde. To the aldehyde prepared above was added toluene (1 mL) followed by portionwise addition of methyl (triphenylphosphoranylidene)acetate (32 mg, 0.105 mmol) (exothermic). Toluene (1 mL) was added to the reaction mixture, and the resulting mixture was heated at 80° C. for 3 hours. The reaction mixture was cooled to room temperature, and then was directly loaded to a short silica-gel column and eluted with the solvent (Hex/EtOAc=20/1) to give the title compound (20 mg, 72%).

Provenance & Evidence