4-fluoro-3,5-dimethylaniline

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The 95 ml. hexane solution of 3,5-dimethylphenylazide prepared in Step A above was charged to a rocker bomb and 20 ml. of hydrogen fluoride was added. The reaction mixture was then aged for 10 hours at room temperature with agitation, after which it was cooled, vented, and poured from the bomb, and the bomb rinsed with 40 ml. of water and 40 ml. of dichloromethane. The combined hexane, dichloromethane and hydrogen fluoride were blown down under nitrogen. The resulting residue was combined with the aqueous rinse, cooled to 0° C., and rendered alkaline with KOH pellets. The residue was then extracted three times with 75 ml. of dichloromethane per extraction, and the combined extracts dried over MgSO4 and then concentrated under reduced pressure to yield 7.34g. (66.2%) of a brown-red oil. This oil was then vacuum distilled at 40 mm. Hg to give 6.70g. of a colorless oil, a 60% yield. The final product had a b.p. of 127°-130° C. at 40 mm. Hg. after which it was cooled poured from the bomb the bomb rinsed with 40 ml The residue was then extracted three times with 75 ml of dichloromethane per extraction the combined extracts dried over MgSO4 concentrated under reduced pressure to yield 7.34g vacuum distilled at 40 mm. Hg to give 6.70g

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In 3 liters of methanol was dissolved 15 g of this 3,5-dimethyl-4-fluoro-1-nitrobenzene, and the resulting solution was treated with nitrogen to replace the air, after which 10 g of palladium carbon was added and catalytic reduction with hydrogen gas was carried out. After completion of the reaction, the insoluble materials were filtered off and the filtrate was concentrated to obtain 12.3 g of 3,5-dimethyl-4-fluoroaniline. the resulting solution was treated with nitrogen After completion of the reaction the insoluble materials were filtered off the filtrate was concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a mixed solution of 100 ml of ethanol and 60 ml of a 2N-NaOH solution were dissolved 12.3 g of the 3,5-dimethyl-4-fluoroaniline and 81 g of 2-chloroethanol, and the resulting solution was subjected to reaction with refluxing for 3 hours. After completion of the reaction, the ethanol was distilled off and the residue was extracted with ethyl acetate, after which the extract was washed with water, dried and then concentrated to obtain 14 g of crude N-(2-hydroxyethyl)-3,5-dimethyl-4-fluoroaniline. Subsequently, this crude compound was dissolved in 100 ml of isopropanol, followed by adding thereto 15 g of iodoethane and 20 g of potassium carbonate, and the reaction was carried out with refluxing for 5 hours. After completion of the reaction, the solvent was distilled off and the residue was extracted with ethyl acetate, and the extract was washed with water, dried and then concentrated to obtain 16 g of a crude product of the desired compound. The crude product was purified by a column chromatography (packing; Wakogel C-300, a registered trade name, mfd. by Wako Pure Chemical Industries, Ltd., eluent: ethyl acetate : n-hexane =1 : 2) to obtain 9.5 g of oily N-ethyl-N-(2-hydroxyethyl)-3,5-dimethyl-4-fluoroaniline. the resulting solution was subjected to reaction with refluxing for 3 hours After completion of the reaction the ethanol was distilled off the residue was extracted with ethyl acetate after which the extract was washed with water dried concentrated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The 95 ml. hexane solution of 3,5-dimethylphenylazide prepared in Step A above was charged to a rocker bomb and 20 ml. of hydrogen fluoride was added. The reaction mixture was then aged for 10 hours at room temperature with agitation, after which it was cooled, vented, and poured from the bomb, and the bomb rinsed with 40 ml. of water and 40 ml. of dichloromethane. The combined hexane, dichloromethane and hydrogen fluoride were blown down under nitrogen. The resulting residue was combined with the aqueous rinse, cooled to 0° C., and rendered alkaline with KOH pellets. The residue was then extracted three times with 75 ml. of dichloromethane per extraction, and the combined extracts dried over MgSO4 and then concentrated under reduced pressure to yield 7.34g. (66.2%) of a brown-red oil. This oil was then vacuum distilled at 40 mm. Hg to give 6.70g. of a colorless oil, a 60% yield. The final product had a b.p. of 127°-130° C. at 40 mm. Hg. after which it was cooled poured from the bomb the bomb rinsed with 40 ml The residue was then extracted three times with 75 ml of dichloromethane per extraction the combined extracts dried over MgSO4 concentrated under reduced pressure to yield 7.34g vacuum distilled at 40 mm. Hg to give 6.70g