تفاعل #344529
ord-3f87614e379b49b08bcd2eef4605a0dd
معادلة التفاعل
المتفاعلات
ظروف التفاعل
المعالجة
- 1درجة الحرارةwas maintained between 15° C. and 20° C
- 2درجة الحرارةThis two-phase solution was heated
- 3درجة الحرارةat reflux for one hour
- 4درجة الحرارةafter which it was cooled
- 5أخرىthe phases separated
- 6تجفيفThe organic layer was dried over anhydrous magnesium sulfate
- 7ترشيحfiltered
- 8أخرىThe filtrate was evaporated under reduced pressure
- 9أخرىleaving a brown oil
- 10استخلاصThe aqueous layer was extracted with ethyl acetate
- 11تجفيفthe extract was dried over anhydrous magnesium sulfate
- 12ترشيحfiltered
- 13أخرىthe solvent was evaporated under reduced pressure
- 14أخرىagain leaving a brown oil
- 15غسيلeluted with methylene chloride/ethyl acetate (90/10)
- 16أخرىthe solvent was evaporated under reduced pressure
الإجراء التجريبي
A solution of 20.0 g (0.0774 mole) of 1-(2-fluoro-4-aminophenyl)-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one in 100 mL of concentrated sulfuric acid was cooled to 15°-20° C. A solution of 5.3 g (0.0774 mole) of sodium nitrite in 20 mL of water was added slowly to the sulfuric acid solution while the temperature was maintained between 15° C. and 20° C. The dark orange solution was stirred for an hour at this temperature. The solution was then added rapidly to a solution of 250 g (1.00 mole) of copper (II) sulfate pentahydrate and 2.0 g (0.0072 mole) of iron (II) sulfate heptahydrate in 250 mL of water and 250 mL of mixed xylenes. This two-phase solution was heated at reflux for one hour, after which it was cooled and the phases separated. The organic layer was dried over anhydrous magnesium sulfate and filtered. The filtrate was evaporated under reduced pressure, leaving a brown oil. The aqueous layer was extracted with ethyl acetate, and the extract was dried over anhydrous magnesium sulfate and then filtered. The extract was combined with the brown oil from the organic phase, and the solvent was evaporated under reduced pressure, again leaving a brown oil. This brown oil was placed on a silica gel column and eluted with methylene chloride/ethyl acetate (90/10). The product-containing fractions were combined, and the solvent was evaporated under reduced pressure, leaving 12.17 g of 1-(2-fluoro-4-hydroxyphenyl)-4-difluoromethyl-4,5-dihydro-3-methyl-1,2,4-triazol-5(1H)-one, m p. 112°-114° C. The NMR spectrum was consistent with the proposed structure.