反应详情

A suspension of 2.5 g (6.8 mmol) of 3-benzenesulphonyl-5-methoxymethyl-2-methylsulphanyl-pyrazolo[1,5-a]pyrimidin-7-ol in 40 ml of POCl3 and 20 ml of diethylaniline was heated at reflux for 1 hr. The reaction solution was cooled to RT and evaporated. The residue was treated with 100 ml of ice-water and the pH value of the solution was adjusted to 8 with sat. NaHCO3 solution. The aqueous phase was extracted three times with 100 ml of CH2Cl2,and the organic phases were dried (MgSO4), filtered and evaporated. Chromatography (SiO2, CH2Cl2/MeOH 20:1) yielded 2.1 g (79%) of 3-benzenesulphonyl-7-chloro-5-methoxymethyl-2-methylsulphanyl-pyrazolo[1,5-a]pyrimidine as a pale yellow powder, m.p. 194-197°.

1. temperaturewas heated
2. temperatureat reflux for 1 hr
3. customevaporated
4. additionThe residue was treated with 100 ml of ice-water
5. extractionThe aqueous phase was extracted three times with 100 ml of CH2Cl2,and the organic phases
6. dry with materialwere dried (MgSO4)
7. filtrationfiltered
8. customevaporated