反应详情

温度

0 °C

1 g of the product obtained in Step 1 (containing 47% amidine) is dissolved in 15 mL of methanol; the resulting solution is then cooled to 0° C. and 100 mg (2.61 mmol, 1.2 equivalents) of sodium tetraborohydride are added. Stirring is carried out overnight at ambient temperature, and then 5.3 mL of 20% aqueous sodium hydroxide solution and 20 mL of dichloromethane are added. Vigorous stirring is carried out for 15 minutes. The organic phase is then extracted, washed with water, dried over MgSO4, filtered and then evaporated to dryness. There is obtained 1 g of an oil which is purified by flash chromatography on 100 g of silica (eluant=dichloromethane/ethanol/NH4OH: 90/10/1) to yield 300 mg of expected product in the form of an oil.

1. stirringVigorous stirring
2. waitis carried out for 15 minutes
3. extractionThe organic phase is then extracted
4. washwashed with water
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customevaporated to dryness