3-(2-Isopropoxyethoxy)-1H-indazole-5-carbaldehyde → 2,6-Bis(difluoromethyl)-4-{3-[2-(propan-2-yloxy)ethoxy]-1H-indazol-5-yl}-1,4-dihydropyridine-3,5-dicarbonitrile

Participants

Reaction Steps

80 mg (0.32 mmol) 3-(2-isopropoxyethoxy)-1H-indazole-5-carbaldehyde (Example 32A), 84 mg (0.71 mmol) 3-amino-4,4-difluorobut-2-enenitrile [obtainable by Thorpe reaction of acetonitrile with 2,2-difluoroacetonitrile, cf. Org. React. 15, 1 (1967), ibid. 31, 1 (1984)] and a small amount of powdered 4 Å molecular sieve in acetic acid (310 μl) were heated to 115° C. for 1 h. After cooling to room temperature, the reaction mixture was diluted with THF and filtered. The filtrate was directly purified by preparative RP-HPLC (acetonitrile/water+0.05% TFA gradient) to give 85 mg (59% of th.) of the title compound.

Provenance & Evidence