Cesium carbonate → di-tert-butyl 1-{1-(3-chlorobenzyl)-2-[1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-5-yl]-1H-pyrrolo[3,2-b]pyridin-5-yl}hydrazine-1,2-dicarboxylate

Participants

Reaction Conditions

Reaction Steps

5-Chloro-1-(3-chlorobenzyl)-2-[1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-5-yl]-1H-pyrrolo[3,2-b]pyridine (0.87 g, 1.8 mmol, from Step 3), di-tert-butyl hydrazine-1,2-dicarboxylate (0.64 g, 2.7 mmol, Aldrich) and Cs2CO3 (0.90 g, 2.7 mmol, Aldrich) were combined in toluene (16 mL) and dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine-(2′-aminobiphenyl-2-yl)(chloro)palladium (1:1) (0.14 g, 0.18 mmol, Aldrich) was added. The mixture was degassed by a stream of nitrogen through the solution for 10 minutes. The reaction was heated in a sealed vial to 130° C. for 55 minutes, then at 135° C. for 40 minutes. Additional di-tert-butyl hydrazine-1,2-dicarboxylate (0.32 g, 1.4 mmol), Cs2CO3 (0.45 g, 1.4 mmol) and dicyclohexyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine-(2′-aminobiphenyl-2-yl)(chloro)palladium (1:1) (0.10 g, 0.13 mmol) were added. The mixture was again degassed, then sealed and heated to 140° C. for 40 minutes. After cooling to room temperature, the mixture was diluted with DCM, filtered and concentrated. Flash chromatography, eluting with a gradient from 0-50% EtOAc in hexanes afforded product as a white solid (0.51 g, 40%). LCMS (M+H)+: 623.3.

Provenance & Evidence