反应详情

A solution of 10 g (0.032 mol) of ethyl 5-phenyl-4-(2-pyridinyl)pyrazole-1-acetate of example 1 in 15 mL (0.095 mol) of 3-(diethylamino)propanamine was heated at 100° for 3 hr. The excess amine was stripped in vacuo and the residue distributed between water and ether. The ether solution was dried over MgSO4, stripped and applied to 350 g of silica gel in a small amount of methylene chloride. The column was eluted with 20:1 acetone-triethylamine and a light yellow oil was obtained that crystallized upon triturating with cyclohexane to yield 5.4 g of product, mp 82°-83° C.

1. dry with materialThe ether solution was dried over MgSO4
2. washThe column was eluted with 20:1 acetone-triethylamine
3. customa light yellow oil was obtained
4. customthat crystallized
5. customupon triturating with cyclohexane