反应详情

To a solution of sodium methoxide (2.16 g; 40.0 mmoles) in 100 ml of CH3OH that was cooled to 0° in an ice-water bath was added 2-[(2-guanidinothiazol-4-yl)methylthio]ethylamine dihydrochloride (6.09 g; 20.0 mmoles) and, after 20 minutes of stirring, the solution was treated with 3,4-dimethoxy-1,2,5-thiadiazole 1-oxide (1.62 g; 10 mmoles). The reaction mixture was stirred at ambient temperature for 65 hours and evaporated under reduced pressure. The residue was chromatographed on 100 g of silica gel (230-400 mesh) by flash chromatography using a gradient elution of acetonitrile-methanol. The appropriate fractions were combined, evaporated and the residue chromatographed on a Preparative HPLC system using μ-porasil silica gel. The appropriate fractions were combined, and evaporated under reduced pressure to give the title compound as an amorphous solid; the NMR spectrum (100 MHz) in d6 dimethyl sulfoxide showed the presence of approximately 0.11 mole of ethanol.

1. stirringThe reaction mixture was stirred at ambient temperature for 65 hours
2. customevaporated under reduced pressure
3. customThe residue was chromatographed on 100 g of silica gel (230-400 mesh) by flash chromatography
4. washa gradient elution of acetonitrile-methanol
5. customevaporated
6. customthe residue chromatographed on a Preparative HPLC system
7. customevaporated under reduced pressure