5-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-3-methyl-thiophene-2-carbaldehyde → 1-{5-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-3-methyl-thiophen-2-yl}-ethanol

Participants

Reaction Steps

Methylmagnesium bromid (1.80 ml, 3M in diethyl ether) is added to a solution of 5-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-3-methyl-thiophene-2-carbaldehyde (Example 1, (ii) step B, 2 g) in tetrahydrofuran (39 ml) under nitrogen at 0° C. The mixture is slowly warmed to room temperature and stirred overnight. After 21 hours, the reaction is quenched with a saturated aqueous solution of NH4Cl in water. The mixture is extracted two times with ethyl acetate. The organic phases are combined, dried over MgSO4 and concentrated in vacuo to yield 1-{5-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-3-methyl-thiophen-2-yl}-ethanol (2.1 g) as a yellowish foam. The crude product obtained is used without further purification. MS (HPLC/MS): 424 (MH+). Retention time: 2.03 min.

Provenance & Evidence