反应详情

To a stirred solution of N,N-diisopropylethylamine (10 ml, 57 mmol) in THF (150 ml), 2,4-dichloroquinazoline [prepared according to the procedure described by Curd, F. H. S. et al., J. Chem. Soc., (1947), 775] (5 g, 25 mmol) and phenylhydrazine (2.7 g, 25 mmol) was added. After stirring for 30 minutes, the reaction was poured into water and extracted with dichloromethane (3×100 ml). The combined organic layers were dried over Na2SO4 and evaporated under reduced pressure. The resulting solid was triturated with ethanol and filtered to afford 2-chloro-4-phenylhydrazinoquinazoline (3.2 g) as a yellow solid, m.p. 178° C. (dec.).

1. extractionextracted with dichloromethane (3×100 ml)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. customevaporated under reduced pressure
4. customThe resulting solid was triturated with ethanol
5. filtrationfiltered