Hydrochloric Acid → 4-(1H-Pyrazol-4-yl)-7-(2-(trimethylsilyl)ethoxy)methyl-7 H-pyrrolo(2,3-d)-pyrimidine

Participants

Reaction Steps

To a reactor equipped with overhead stirring, condenser, thermowell, and nitrogen inlet was charged crude 4-(1-(1-ethoxyethyl)-1H-pyrazol-4-yl)-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine (15, 1030.9 g based on 100% conversion, 2.66 mol), tetrahydrofuran (THF, 0.9 L), water (H2O, 4.4 L), and a 10% aqueous HCl solution (2.7 L, 10.64 mol, 3.44 equiv) at room temperature. The resulting reaction mixture was stirred at room temperature for 2-5 h. When the reaction was deemed complete by HPLC analysis, the reaction mixture was treated with a 30% aqueous sodium hydroxide (NaOH) solution (940 mL, 11.70 mol, 3.78 equiv) at room temperature. The resulting reaction mixture was stirred at room temperature for 1-2 h. The solids were collected by filtration, washed with water (2×0.75 L), and dried in a vacuum oven at 45-55° C. to constant weight to afford the crude 4-(1H-pyrazol-4-yl)-7-(2-trimethylsilanyl-ethoxymethyl)-7H-pyrrolo[2,3-d]pyrimidine (5, 826.8 g, 839.1 g theoretical, 98.5% yield) as off-white solids (94.2 area % pure by HPLC). This crude material was subsequently recrystallized in acetonitrile to afford pure compound 5 (738.4 g, 839.1 g theoretical, 88% yield) as white crystals (99.5 area % by HPLC), which was found to be identical in every comparable aspect to the material made from Method A.

Provenance & Evidence