Reacción #1279208

Ecuación de reacción

(2′R,3′S,4′S,5′R)-6-chloro-4′-(3-chloro-2-fluoro-phenyl)-2′-(2,2-dimethyl-propyl)-1′-((1R,2S)-2-hydroxy-1,2-diphenyl-ethyl)-2-oxo-1,2-dihydro-spiro[indole-3,3′-pyrrolidine]-5′-carboxylic acid (trans-4-hydroxy-cyclohexylmethyl)-amide

cerium ammonium nitrate

sodium hydrogencarbonate

acetonitrile

→

(2′S,3′R,4′S,5′R)-6-chloro-4′-(3-chloro-2-fluoro-phenyl)-2′-(2,2-dimethyl-propyl)-2-oxo-1,2-dihydro-spiro[indole-3,3′-pyrrolidine]-5′-carboxylic acid (trans-4-hydroxy-cyclohexylmethyl)-amide

Rendimiento 16.6%

Disolventes

ethyl acetate

acetone

water

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroIn a three-neck 50 mL flask were successively introduced
2. 2
   workup.ADDITIONwere added
3. 3
   workup.STIRRINGstirring
4. 4
   Temperaturawas maintained for minutes
5. 5
   Otrodecanted
6. 6
   OtroThe organic phase was separated
7. 7
   Extracciónthe aqueous phase was extracted twice with mL of ethyl acetate
8. 8
   LavadoThe combined organic extracts were washed with 20 mL of water
9. 9
   Secadodried with magnesium sulfate
10. 10
    Concentraciónconcentrated to dryness under reduced pressure
11. 11
    OtroThe residue was purified by flash chromatography on a 30 g silica cartridge (15-40 μm silica gel; eluting solvent: dichloromethane; flow: 30 mL/min)
12. 12
    Otrofollowed by a second purification by flash chromatography on a 15 g silica cartridge (15-40 μm silica gel; eluting solvent: dichloromethane/methanol/28% ammonia 97/2/1 v/v/v; flow: 30 mL/min)

Procedimiento

In a three-neck 50 mL flask were successively introduced 0.70 g (0.91 mmol) of (2′R,3′S,4′S,5′R)-6-chloro-4′-(3-chloro-2-fluoro-phenyl)-2′-(2,2-dimethyl-propyl)-1′-((1R,2S)-2-hydroxy-1,2-diphenyl-ethyl)-2-oxo-1,2-dihydro-spiro[indole-3,3′-pyrrolidine]-5′-carboxylic acid (trans-4-hydroxy-cyclohexylmethyl)-amide, 7.0 mL of acetonitrile, 3.5 mL of distilled water and 3.5 mL of acetone. The resulting mixture was stirred and cooled to 0° C. and 0.99 g (1.81 mmol) of cerium ammonium nitrate was added in small portions. The reaction mixture was stirred at 0° C. for 20 minutes, upon which 89 mg (1.06 mmol) of sodium hydrogencarbonate were added and stirring was maintained for minutes. The mixture was diluted with 60 mL of ethyl acetate and decanted. The organic phase was separated and the aqueous phase was extracted twice with mL of ethyl acetate. The combined organic extracts were washed with 20 mL of water, dried with magnesium sulfate and then concentrated to dryness under reduced pressure. The residue was purified by flash chromatography on a 30 g silica cartridge (15-40 μm silica gel; eluting solvent: dichloromethane; flow: 30 mL/min) followed by a second purification by flash chromatography on a 15 g silica cartridge (15-40 μm silica gel; eluting solvent: dichloromethane/methanol/28% ammonia 97/2/1 v/v/v; flow: 30 mL/min). 87 mg of (2′S,3′R,4′S,5′R)-6-chloro-4′-(3-chloro-2-fluoro-phenyl)-2′-(2,2-dimethyl-propyl)-2-oxo-1,2-dihydro-spiro[indole-3,3′-pyrrolidine]-5′-carboxylic acid (trans-4-hydroxy-cyclohexylmethyl)-amide were obtained as a white solid. mp: 192° C. (Kofler); LC-MS: tR (min)=0.84; [M+H]+: m/z 576; [M−H]−: m/z 574 (method A); 1H NMR (CHLOROFORM-d, 400 MHz): mixture of isomers: 0.90 (s, 9 H); 0.99 to 2.09 (m partially hidden, 11 H); 3.05 to 3.27 (m, 2 H); 3.59 (m, 2 H); 4.39 (d, J=8.8 Hz, 1 H); 4.59 (m, 1 H); 6.76 (s large, 1 H); 6.99 (t, J=7.8 Hz, 1 H); 7.06 to 7.56 (m, 6 H); 7.82 (t broad, J=6.1 Hz, 1 H).

Fuente