反应详情

By the procedures of Example 4, 5.3 g (60 mmol) of ethyl urea was reacted with 10.9 g (50 mmol) of ethyl 2-chloro-4,4,4-trifluoroacetoacetate at 140°-150° C. for 24 hours. The product mixture was treated with methylene chloride, washed with water, dried and concentrated. The residue was recrystallized from methylcyclohexane to yield 8.0 g of crystal product (m.p.=89°-90° C.) identified in Table I.

1. washwashed with water
2. customdried
3. concentrationconcentrated
4. customThe residue was recrystallized from methylcyclohexane