Lithium Hexamethyldisilazide → HCID 57504324, compound

Participants

Reaction Steps

A solution of lithium bis(trimethylsilyl)amide (0.947 mL, 0.95 mmol) was added dropwise to a stirred solution of (S)-2-hydroxy-3-methoxy-N-(3-methyl-1,2,4-thiadiazol-5-yl)propanamide (Intermediate E1) (187 mg, 0.86 mmol) in anhydrous THF (5 mL) over a period of 3 minutes under nitrogen. The resulting suspension was stirred at ambient temperature for 10 minutes and then a solution of 4-chloro-1-(2-chlorophenyl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate B1) (228 mg, 0.86 mmol) in dry THF (1.5 mL) added dropwise over 1 minute and the reaction heated to 50° C. for 16 hours. Reaction was cooled, diluted with EtOAc (50 mL), washed with 1M citric acid (25 mL) and brine (25 mL), dried (MgSO4), and evaporated. The residue was purified by flash silica chromatography, elution gradient 0 to 100% EtOAc in isohexane to afford (2S)-2-(1-(2-chlorophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-3-methoxy-N-(3-methyl-1,2,4-thiadiazol-5-yl)propanamide (44 mg, 11%) 1H NMR (400 MHz, CDCl3) δ 2.48 (3H, s), 3.41 (3H, s), 4.01 (2H, ddd), 6.13 (1H, t), 7.38-7.48 (3H, m), 7.56 (1H, dd), 8.34 (1H, s), 8.51 (1H, s), 9.90 (1H, s). m/z (ESI+) (M+H)+=446.08; HPLC tR=2.02 min.

Provenance & Evidence