Reacción #979287

Ecuación de reacción

(R)-8-Benzyl-2-bromo-7,8-dihydro-1-methoxymethyl-4-(n-propyl)-1H-imidazo[2,1-i]purin-5(4H)-one

Compound 36a

(R)-8-Benzyl-2-bromo-7,8-dihydro-1-methoxymethyl-4-(n-propyl)-1H-imidazo[2,1-i]purin-5(4H)-one

water

methylmercaptan sodium salt

→

title compound

Rendimiento 84.0%

(R)-8-Benzyl-7,8-dihydro-1-methoxymethyl-2-methylthio-4-(n-propyl)-1H-imidazo[2,1-i]purin-5(4H)-one

Rendimiento 84.0%

Disolventes

N,N-dimethylformamide

Condiciones de reacción

Tratamiento posterior

1. 1
   Extracciónthe mixture was extracted with chloroform
2. 2
   Lavadothe organic layer was washed with saturated aqueous sodium chloride
3. 3
   Secadodried over anhydrous sodium sulfate
4. 4
   Otrothe solvent was evaporated
5. 5
   OtroThe reaction residue was purified by silica gel column chromatography (chloroform:methanol=98:2)
6. 6
   Concentraciónthe eluent was concentrated
7. 7
   workup.ADDITIONTo the residue was added acetonitrile
8. 8
   Filtraciónthe deposited crystals were collected by filtration

Procedimiento

6-Methylthio-3-(n-propyl)-7H-purin-2(3H)-one (Compound B8, 11.8 g, 52.5 mmol), which was obtained by the method described in Journal of Heterocyclic Chemistry (J. Heterocycl. Chem.), 30, p. 241, 1993, was dissolved in N,N-dimethylformamide (200 mL). To the solution was added sodium hydride (1.51 g, 63.0 mmol, 1.2 equivalents) and the mixture was stirred at room temperature for 30 minutes. To the reaction solution was added chloromethyl methyl ether (4.85 mL, 63.9 mmol, 1.2 equivalents) and the mixture was stirred at room temperature for 1 hour. To the reaction solution was added saturated aqueous ammonium chloride, the mixture was extracted with chloroform, and the organic layer was washed with saturated aqueous sodium chloride and dried over anhydrous sodium sulfate. Then, the solvent was evaporated, and to the resulting residue was added diethyl ether. The deposited crystals were collected by filtration to obtain a methoxymethyl adduct. (R)-8-Benzyl-2-bromo-7,8-dihydro-1-methoxymethyl-4-(n-propyl)-1H-imidazo[2,1-i]purin-5(4H)-one (Compound 36a, 2.81 g, 6.52 mmol), which was obtained from the methoxymethyl adduct in a manner similar to that in Example 35, was dissolved in N,N-dimethylformamide (26 mL), to the solution was added an about 15% aqueous solution of methylmercaptan sodium salt (6.10 mL, 13.1 mmol, 2.0 equivalents), and the mixture was stirred at room temperature for three days. To the reaction solution was added water, the mixture was extracted with chloroform, then the organic layer was washed with saturated aqueous sodium chloride and dried over anhydrous sodium sulfate, and the solvent was evaporated. The reaction residue was purified by silica gel column chromatography (chloroform:methanol=98:2) and the eluent was concentrated. To the residue was added acetonitrile, and the deposited crystals were collected by filtration to obtain the title compound (2.17 g, 84%) as white crystals.

Fuente