Trifluoroacetic acid → 6-Bromo-N'-(4-morpholinylacetyl)-1-(tetrahydro-2H-pyran-2-yl)-1H-indazole-4-carbohydrazide

Participants

Reaction Conditions

Reaction Steps

6-Bromo-N′-(4-morpholinylacetyl)-1H-indazole-4-carbohydrazide (0.232 g, 0.607 mmol) in ethyl acetate (3 ml) was treated with 3,4-dihydro-2H-pyran (0.111 ml, 1.214 mmol) then heated to 50° C. under nitrogen. Trifluoroacetic acid (4 drops) was added and heating continued for 1.5 h at 50° C. A further portion of 3,4-dihydro-2H-pyran (0.111 ml, 1.214 mmol) and trifluoroacetic acid (0.047 ml, 0.607 mmol) were added and heating continued for a further 1.5 h. The solution was left to stand at room temperature for 18 h. The clear solution was diluted with ethyl acetate (5 ml), washed with saturated aqueous sodium bicarbonate (2×10 ml), filtered through a phase separator cartridge then blown to dryness and left under vacuum. The crude product was dissolved in dichloromethane (2 ml) and purified on a silica (5 g) cartridge which was eluted with a gradient of methanol and chloroform and the appropriate fractions evaporated to give the title compound as a beige gummy solid (0.199 g).

Provenance & Evidence