反应详情

A procedure analogous to that described in Example 1 was followed except 20.0 g (164 mM) of ethoxymethylene malononitrile in 250 ml of warm ethanol were added to 13.4 ml (15.0 g, 197 mM) of 2-hydroxyethylhydrazine in 30 ml of ethanol maintained at 45°-50°. Following completion of the reaction and subsequent cooling of the mixture, the crystalline product was removed by filtration, and washed with ether to afford 20.5 g (82%) of the title compound: mp, 160°-161°: tlc, Rf =0.28, silica gel, ethyl acetate (100%).

1. temperaturemaintained at 45°-50°
2. customcompletion of the reaction
3. temperaturesubsequent cooling of the mixture
4. customthe crystalline product was removed by filtration
5. washwashed with ether