p-Toluenesulfonic acid → (E)-5-bromo-6-methoxy-2-(4-((trifluoromethyl)thio)benzylidene)-2,3-dihydro-1H-inden-1-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 11 (250 mg, 1.04 mol) in toluene 15 mL was added 4-((trifluoromethyl)thio)benzaldehyde 72 (235 mg, 1.144 mol). PTSA (357 mg, 2.08 mol) was added to the reaction mass, which was stirred at 120° C. for 6 h, diluted with ethyl acetate and washed with water (3×25 mL). The organic layer was dried over sodium sulphate and concentrated to get the crude compound 104 which was purified through flash chromatography by using 100-200 mesh silica gel. The compound 104 was eluted at 10% ethyl acetate in hexane to afford yellow coloured solid (E)-5-bromo-6-methoxy-2-(4-((trifluoromethyl)thio)benzylidene)-2,3-dihydro-1H-inden-1-one 104.

Provenance & Evidence