| 16.8 - 22.87% |
With caesium carbonate;copper(l) iodide; 2-acetylcyclohexanone; In N,N-dimethyl-formamide; at 90℃; for 20h;Product distribution / selectivity; |
Methyl 4-iodobenzoate (2.84 g, 10.86 mmol), cesium carbonate (7.07 g, 21.71 mmol), 2-acetylcyclohexanone (0.286 mL, 2.17 mmol) and copper(I) iodide (0.103 g, 0.54 mmol) were added to a stirred solution of 2,3,4,6,7,8,9,9a-<strong>[4430-75-5]octahydro-1H-pyrido[1,2-a]pyrazine</strong> (1.5224 g, 10.86 mmol) in DMF (30 mL) under nitrogen. The resulting suspension was stirred at 90 C. for 20 h. The reaction mixture was evaporated to dryness and dissolved in methanol. The crude product was purified by ion exchange chromatography, using a SCX column. The desired product was eluted from the column using 3.5M NH3/MeOH and pure fractions were evaporated to dryness to afford a brown gum. This was purified again by silica column chromatography, eluting with 5% MeOH (containing 0.1% ammonium hydroxide) in DCM. Pure fractions were evaporated to dryness to afford the desired compound (0.503 g, 16.8%) as an orange solid 1H NMR (399.9 MHz, CDCl3) delta 1.29-1.33 (1H, m), 1.26-1.40 (1H, m), 1.62 (1H, d), 1.64 (1H, d), 1.65-1.68 (1H, m), 1.69 (1H, s), 1.80-1.82 (1H, m), 2.04-2.10 (2H, m), 2.32-2.39 (1H, m), 2.61 (1H, d), 2.89 (2H, d), 3.01-3.08 (1H, m), 3.58-3.63 (1H, m), 3.70-3.75 (1H, m), 3.86 (3H, s), 6.83-6.87 (2H, m), 7.89-7.93 (2H, m). MS m/z=275 (MH+).; Methyl -4-iodobenzoate (2.84 g, 10.86 mmol), cesium carbonate (7.07 g, 21.71 mmol), 2-acetylcyclohexanone (0.286 mL, 2.17 mmol) and copper(I) iodide (0.103 g, 0.54 mmol) were added to a stirred solution of 2,3,4,6,7,8,9,9a-<strong>[4430-75-5]octahydro-1H-pyrido[1,2-a]pyrazine</strong> (1.5224 g, 10.86 mmol) in DMF (30 mL) under nitrogen. The resulting suspension was stirred at 90 C. for 20 h. The reaction mixture was evaporated to dryness. The crude product was purified by ion exchange chromatography, using a SCX column. The desired product was eluted from the column using 3.5M NH3/MeOH and fractions were evaporated to dryness to afford the crude product as an impure brown gum. The crude product was purified by silica column chromatography, eluting with 5% MeOH, 0.1% aqueous ammonia in DCM. Pure fractions were evaporated to dryness to afford the desired compound (0.681 g, 22.87%) as an orange solid. 1H NMR (399.9 MHz, CDCl3) delta 1.29-1.33 (1H, m), 1.26-1.40 (1H, m), 1.62 (1H, d), 1.64 (1H, d), 1.65-1.68 (1H, m), 1.69 (1H, s), 1.80-1.82 (1H, m), 2.04-2.10 (2H, m), 2.32-2.39 (1H, m), 2.61 (1H, d), 2.89 (2H, d), 3.01-3.08 (1H, m), 3.58-3.63 (1H, m), 3.70-3.75 (1H, m), 3.86 (3H, s), 6.83-6.87 (2H, m), 7.89-7.93 (2H, m). MS: m/z 275 (MH+). |
Chemistry
Pharmaceutical Intermediates
Inhibitors/Agonists
Material Science
HazMat Fee +
For Research Only
110K+ Compounds
Competitive Price
1-2 Day Shipping
