Tetrahydrofuran → N-{2,4-Dimethyl-5-[6-(pyridin-3-yl)-1H-imidazo[1,2-b]pyrazol-1-yl]phenyl}-3-(3-methyloxetan-3-yl)benzamide

Participants

Reaction Conditions

Reaction Steps

In a microwave reaction vessel, 302 mg (1.98 mmol) of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were added to a mixture of 200 mg (0.660 mmol) of the compound of Example 11A, 150 mg (0.660 mmol) of the compound of Example 99A, 209 mg (0.793 mmol) of molybdenum hexacarbonyl, 19 mg (0.066 mmol) of tri-tert-butylphosphonium tetrafluoroborate and 62 mg (0.066 mmol) of trans-bis-(acetato)-bis-[o-(di-o-tolylphosphino)benzyl]dipalladium(II) in 4.5 ml of THF. After addition of the DBU, the reaction vessel was quickly closed with a crimp closure. The mixture was then heated in a microwave oven (Biotage Initiator, with Dynamic Field Tuning) at 140° C. for 30 min. After cooling to RT, about 15 ml of water were added and the reaction mixture was extracted three times with in each case about 15 ml of ethyl acetate. The combined organic extracts were washed with saturated aqueous sodium chloride solution and then dried over magnesium sulphate. After filtration and evaporation of the solvent, the residue that remained was separated into its components by preparative HPLC (Method 33). Since the product fractions were still impure, the preparative HPLC purification was repeated with this fraction using the same method. This gave an impure fraction of 15 mg and a clean fraction consisting of 6 mg (2% of theory) of the title compound.

Provenance & Evidence