Ammonia → HCID 89690930, compound

Participants

Reaction Conditions

Reaction Steps

7.000 g (purity 38%, 7.090 mmol) of 3-(5,6-dichloro-1,2,4-triazin-3-yl)-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine in 200 ml of absolute THF were initially introduced. With ice-cooling, 4.254 ml (8.508 mmol) of 2N ammonia solution in ethanol were added and the mixture was stirred for 1 h at 0° C. Again with ice-cooling, 4.254 ml (8.508 mmol) of 2N ammonia solution in ethanol were added and the mixture was stirred for 1.5 h at RT. 30 ml (60.000 mmol) of 2N ammonia solution in ethanol was added and the mixture was stirred for 15 min at RT. The reaction mixture was concentrated on a rotary evaporator, suspended in 100 ml of dichloromethane, admixed with 50 ml (100.00 mmol) of 2N ammonia solution in ethanol and stirred for 2 h at RT. The mixture was concentrated on a rotary evaporator and purified by chromatography on silica gel (mobile phase: dichloromethane/methanol, gradient 20:1→10:1). The product-containing fractions were concentrated and stirred with DMSO. The solid was filtered off with suction, after-washed with acetonitrile and dried under high vacuum. The residue was purified by preparative HPLC (mobile phase: acetonitrile/water, gradient 20:80→100:0). This gave 1.68 g of the target compound (purity 65%; 43% of theory).

Provenance & Evidence