HCID 23023940, compound → p-Cyclohexylbenzaldehyde

Participants

Reaction Steps

Under an argon stream, tetrahydrofuran (1000 ml, 5.7 v/w) was added to methyl 4-(N-(4-(4-aminophenyl)-2-thiazolyl)-N-methylaminomethyl)benzoate (174.0 g, 0.493 mol) obtained in Example 1(4) and dissolved therein. A solution of 4-cyclohexylbenzaldehyde (120.6 g, 0.641 mol) obtained in Production Example 1(2) in tetrahydrofuran (740 ml, 4.3 v/w) was added. Acetic acid (56.4 ml, 0.986 mol) was added and the mixture was stirred at room temperature for 1 hr. With stirring under ice-cooling, sodium triacetoxyborohydride (104.5 g, 0.493 mol) was added and the mixture was stirred at room temperature for 1.5 hr. After ice-cooling, acetic acid (28.2 ml, 0.493 mol) and sodium triacetoxyborohydride (52.2 g, 0.246 mol) were added and the mixture was stirred at room temperature for 1.5 hr. The reaction mixture was ice-cooled and carefully added to a saturated aqueous sodium hydrogen carbonate solution (2262 ml, 13.0 v/w). After stirring at room temperature for 1 hr, the mixture was extracted with ethyl acetate (522 ml), and the organic layer was washed successively with distilled water (174 ml) and saturated brine (522 ml) and dried over magnesium sulfate (50.0 g). The solvent was evaporated and the obtained orange solid was purified by silica gel column chromatography (developing solvent chloroform:ethyl acetate=99.5:0.5) to give the title compound (80.3 g, yield 31.0%) as a pale-yellow solid.

Provenance & Evidence