تفاعل #7100

معادلة التفاعل

bromine

3-(1′,2′-dihydro-2′-oxospiro[cyclohexane-1,3′-[3H]indol]-5′-yl)-5-fluorobenzonitrile

potassium acetate

→

title compound

المردود 43.0%

3-(7′-Bromo-1′,2′-dihydro-2′-oxospiro[cyclohexane-1,3′-[3H]indol]-5′-yl)-5-fluoro-benzonitrile

المردود 43.0%

المذيبات

acetic acid

acetic acid

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas poured onto ice (20 g)
2. 2
   أخرىThe layers were separated
3. 3
   استخلاصthe aqueous layer was extracted with dichloromethane (2×10 mL)
4. 4
   غسيلwashed sequentially with 10% aqueous sodium thiosulfate (20 mL), water (2×10 mL), saturated sodium bicarbonate (10 mL) and brine (15 mL)
5. 5
   تجفيفdried over MgSO4
6. 6
   ترشيحThe solution was filtered
7. 7
   تركيزconcentrated in vacuo
8. 8
   أخرىthe residue was purified by flash column chromatography on silica gel (eluting with 30% EtOAc/hexane)

الإجراء التجريبي

A mixture of 3-(1′,2′-dihydro-2′-oxospiro[cyclohexane-1,3′-[3H]indol]-5′-yl)-5-fluorobenzonitrile (0.40 g, 1.23 mmol) and potassium acetate (0.13 g, 1.3 mmol) in glacial acetic acid (3 mL) at room temperature was treated with a solution of bromine (1.05 eq, 0.21 g, 1.3 mmol) in a glacial acetic acid (3 mL). After stirring for 1 h the mixture was poured onto ice (20 g). The layers were separated and the aqueous layer was extracted with dichloromethane (2×10 mL). The organic layers were combined, washed sequentially with 10% aqueous sodium thiosulfate (20 mL), water (2×10 mL), saturated sodium bicarbonate (10 mL) and brine (15 mL) and dried over MgSO4. The solution was filtered, concentrated in vacuo, and the residue was purified by flash column chromatography on silica gel (eluting with 30% EtOAc/hexane) to give the title compound (0.21 g, 43%) as an oil which crystallized upon addition of 10% EtOAc/hexanes, mp 217° C. 1H NMR (CDCl3; 300 MHz) δ 1.56–2.04 (m, 10H), 7.33 (dddd, 1H, J=1.25, 2.3, 3.6 and 9.0 Hz), 7.45 (m, 1H), 7.47 (m, 2H), 7.54 (m, 1H), 7.60 (m, 1H). MS ((−)−ESI) m/z 399 [M−]. Anal. Calcd for C20H16BrFN2O1: C, 60.17; H, 4.04; N, 7.02. Found: C, 60.03; H, 4.08; N, 6.83.

المصدر