تفاعل #1356976

معادلة التفاعل

Cyclohexanol

triphenylphosphine

dibenzyl azodicarboxylate

1H-indazol-5-ol

→

5-(cyclohexyloxy)-1H-indazole

المردود 43.4%

المذيبات

tetrahydrofuran

ظروف التفاعل

المعالجة

1. 1
   أخرىthe mixture thus obtained
2. 2
   تركيزthe reaction solution was concentrated under reduced pressure
3. 3
   workup.ADDITIONa-1M aqueous sodium hydroxide solution (20 ml) was added to the resulting residue
4. 4
   استخلاصfollowed by extraction with ethyl acetate (20 ml×2)
5. 5
   تجفيفThe organic layer was dried over anhydrous magnesium sulfate
6. 6
   أخرىThe organic layer dried
7. 7
   تركيزwas concentrated under reduced pressure
8. 8
   أخرىthe resulting residue was purified by a silica gel column chromatography (eluent: chloroform/methanol, hexane/ethyl acetate)

الإجراء التجريبي

Cyclohexanol (0.315 ml, 2.98 mmol), triphenylphosphine (442 mg, 1.64 mmol) and dibenzyl azodicarboxylate (534 mg, 1.17 mmol) were added at 0° C. to a solution of the 1H-indazol-5-ol (200 mg, 1.49 mmol) obtained in Reference Example 4 in tetrahydrofuran (16 ml). After 30 minutes, the mixture thus obtained was warmed up to room temperature. After stirring overnight, the reaction solution was concentrated under reduced pressure and a-1M aqueous sodium hydroxide solution (20 ml) was added to the resulting residue, followed by extraction with ethyl acetate (20 ml×2). The organic layer was dried over anhydrous magnesium sulfate. The organic layer dried was concentrated under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: chloroform/methanol, hexane/ethyl acetate) to obtain 5-(cyclohexyloxy)-1H-indazole (140 mg, 43%).

المصدر