1,1,3,3-Tetramethylguanidine → HCID 86677250, compound

Participants

Reaction Conditions

Reaction Steps

A solution of [(Z)-3-(dimethylamino)-3-pyrazolo[1,5-a]pyridin-3-yl-prop-2-enylidene]-dimethyl-ammonium hexafluorophosphate (Intermediate 70, 116 mg, 0.3 mmol) in 2-s methoxyethanol (2 mL) was added dropwise to a stirred solution of 1-(5-amino-2-methoxy-4-(4-methylpiperazin-1-yl)phenyl)guanidine (Intermediate 72, 84 mg, 0.30 mmol) and 1,1,3,3-tetramethylguanidine (0.056 mL, 0.45 mmol) in 2-methoxyethanol (2 mL) at r.t. under N2. The resulting solution was sealed into a microwave tube and heated to 120° C. for 0.25 h then cooled to r.t. Further 1,1,3,3-tetramethylguanidine (0.056 mL, 0.45 mmol) was then added and the mixture was stirred at 120° C. for 0.25 h, then at 140° C. for 0.25 h. The mixture was cooled, diluted with EtOAc (10 mL), and washed with water (2×5 mL). The aqueous solution was extracted with EtOAc (5 mL) and the organic solution was washed with water (2×3 mL). The combined organic solutions were dried (MgSO4) and concentrated in vacuo. Purification by FCC, eluting with 1.5-5% 7N methanolic ammonia in CH2Cl2 gave the title compound (69 mg, 53%) as a yellow foam; 1H NMR: 2.25 (3H, d), 2.51 (4H, m), 2.87 (4H, t), 3.73 (3H, s), 4.37 (2H, s), 6.72 (1H, s), 7.07 (1H, m), 7.22 (1H, d), 7.33 (1H, s), 7.40 (1H, m), 7.98 (1H, s), 8.31 (1H, d), 8.52 (1H, d), 8.76 (1H, s), 8.79 (1H, d); m/z: ES+ MH+ 431.

Provenance & Evidence