Reaktion #160406

Reaktionsgleichung

cis-3-[(4-Hydroxy-4-methyl-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester

lithium hydroxide

→

cis-3-[(4-Hydroxy-4-methyl-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid

Ausbeute 74.0%

Lösungsmittel

tetrahydrofuran

water

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionwas then extracted with ether (2×10 mL)
2. 2
   SonstigeAqueous phase was separated
3. 3
   Extraktionextracted with dichloromethane (3×30 mL)
4. 4
   Trocknendried over sodium sulfate
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe crude was purified by chromatography (10% methanol/dichloromethane)

Vorschrift

To a solution of cis-3-[(4-Hydroxy-4-methyl-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester (70.0 mg, 0.149 mmol, 1 eq) in tetrahydrofuran (1 mL), water (0.5 mL) and methanol (0.5 mL) was added lithium hydroxide (19.0 mg, 0.447 mmol, 3 eq). The resulting mixture was stirred 3 h at room temperature and was then extracted with ether (2×10 mL). Aqueous phase was separated and combined organic phases were discarded. Aqueous phase was acidified to pH 1 and extracted with dichloromethane (3×30 mL). Organic phases of dichloromethane were combined, dried over sodium sulfate and concentrated. The crude was purified by chromatography (10% methanol/dichloromethane) to give 50 mg (74%) of cis-3-[(4-Hydroxy-4-methyl-cyclohexyl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid. NMR 1H (CDCl3, 400 MHz): 7.60 ppm (d, 2H); 7.39 ppm (m, 3H); 7.03 ppm (s, 1H); 4.51 ppm (bs, 2H); 2.00 ppm (m, 1H); 1.80-1.20 ppm (m, 15H); 1.12 ppm (s, 3H); 0.71 ppm (d, 3H); 0.60 ppm (m, 2H).

Quelle