| 75% |
With sodium carbonate;5%-palladium/activated carbon; In 2-methylpropyl acetate; water; at 70 - 80℃; for 3h; |
Example 1; Preparation of [5-(3-Fluoro-phenyl)-pyridin-2-ylmethyl]-phosphonic acid diethyl ester; To a reaction vessel was charged (100 g, 0.29 mol) of phosphonate compound 139 (where R9 is ethyl- for all occurrences), 5% Pd/C 50% wet (5.0 g), 3-fluorophenylboronic acid (61 g; 0.44 mol) and sodium carbonate (100 g; 0.94 mol). 600 ml of iso-butyl acetate was charged and the mixture agitated. 400 ml of water was charged, and the agitated mixture was heated to 70-80 C. for at least 3 h at which time an HPLC assay indicated complete reaction. Upon completion, the reaction mixture was cooled to 25 C. and filtered to remove the Pd/C catalyst. The catalyst cake was washed with 200 ml iso-butyl acetate (combined with the filtrate/batch) and 100 ml water (waste). 25% sodium hydroxide solution was used to adjust batch to pH 11-13. During the process the reaction mixture was maintained at a temperature of from 20 C. to 30 C. The organic layer was separated and washed with 500 ml water with agitation. A 25% sodium hydroxide solution was used to adjust the pH of the batch to a pH value of from pH 11 to pH13. Throughout the was the temperature was maintained at a value of from about 20 C. to about 30 C. After washing the layers were separated and the organic layer was washed with 300 ml of 2% sodium chloride solution with 10-15 minutes with agitation. The layers were separated and an HPLC assay of the organic layer indicated impurities were reduced to a desirable level. Darco (10 g) was added to the organic layer. The resultant slurry was agitated for 1 hour, and then filtered to remove the de-coloring agent. The filter cake was washed with 200 ml iso-butyl acetate (combined with the filtrate/batch) and the batch was concentrated under reduced pressure to about 200 ml at from 40 C. to 50 C., then cooled to a temperature of from 15 C. to 25 C. Heptanes (1000 ml) were charged into the cold concentrate over 2.5-3 hr, maintaining the temperature at from about 15 C. to 25 C. The mixture was cooled to a temperature of from -15 C. to -5 C. over 3 hr and agitated at the same temperature for 1 hr. The crystalline solid was filtered, washed with 200 ml heptanes, and dried overnight under vacuum at a temperature of from about 25 C. to 35 C. to provide 70.37 g (75%). Mp 61-63 C. 1H NMR (CDCl3) delta 1.3 (t, J=7.05 Hz, 6H), 3.47 (d, J=22.02 Hz, 2H), 4.12 (q, J=7.08 Hz, 4H), 7.10 (ddd, J=8.42, 2.55, 0.88, Hz, 1H), 7.28 (ddd, J=9.85, 2.36, 1.80 Hz, 1 H), 7.36 (dt, J=7.86, 1.27, Hz, 1H), 7.46 (m, 1H), 7.83 (ddd, J=8.1, 2.2, 0.32 Hz, 1H), 8.76 (d, J=2.38, 1H). |
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