Diisopropylamine → (2,3,4-Trimethoxy-6-methylphenyl)(2,3-dichloro-5-trifluoromethyl-4-pyridyl)methanol

Participants

Reaction Conditions

Reaction Steps

70.0 ml (106 mmol) of n-butyllithium (1.5 M hexane solution) was dropwise added to a diethyl ether 120 ml solution of 15.0 ml (107 mmol) of diisopropylamine at 0° C., followed by stirring for 1 hour. The solution was cooled to −78° C., a diethyl ether 10 ml solution of 22.1 g (102 mmol) of 2,3-dichloro-5-trifluoromethylpyridine was added thereto, followed by stirring for 30 minutes, and then a toluene 40 ml solution of 21.0 g (100 mmol) of 2,3,4-trimethoxy-6-methylbenzaldehyde was added thereto, followed by stirring for 2 hours. 30 ml of water was added to the mixture to terminate the reaction, the aqueous layer was extracted with ethyl acetate, and then the organic layer was dried over anhydrous sodium sulfate and subjected to filtration, and the solvent was distilled off under reduced pressure. The crude product thus obtained was purified by silica gel column chromatography to obtain 24.8 g (yield 58%) of (2,3,4-trimethoxy-6-methylphenyl)(2,3-dichloro-5-trifluoromethyl-4-pyridyl)methanol (m.p. 95-98° C.).

Provenance & Evidence