反应详情

温度

120 °C

To a solution of 1-(diphenylmethyl)azetidin-3-one (see Bioorg. Med. Chem. Lett.; 13; 2003; 2191-2194, 1.32 g, 5.6 mmol) and octahydro-6H-pyrido[1,2-a]pyrazin-6-one hydrochloride (see Bioorg. Med. Chem.; 2004; 71-86; 1.30 g, 6.8 mmol), in methanol (10 mL) was added acetic acid (1 mL). The solution was mixed with (polystyrylmethyl) trimethylammonium cyanoborohydride (4.2 mmol/g, 1.67 g, 8.8 mmol) and the mixture was heated for 5 min at 120° C. using microwave single node heating. The resin was filtered off and then the solvent was removed by evaporation. The product was purified by means of silica gel chromatography using a mixture of ammonia saturated methanol (2%) and methylene chloride. There was obtained 0.58 g (28%) of 2-[1-(diphenylmethyl)azetidin-3-yl]octahydro-6H-pyrido[1,2-a]pyrazin-6-one as an oil. 1H NMR (500 MHz, CDCl3): 1.4 (q, 1H), 1.7 (t, 2H), 1.8-2.0 (m, 3H), 2.3-2.4 (m, 1H), 2.4-2.5 (d, 1H), 2.7-2.8 (t, 3H), 3.0 (m, 3H), 3.4-3.6 (m, 3H), 4.5 (s, 1H), 4.6 (d, 1H), 7.2 (m, 2H), 7.3 (m, 4H), 7.4 (m, 4H); LCMS: m/z 376 (M+1)+.

1. temperatureheating
2. filtrationThe resin was filtered off
3. customthe solvent was removed by evaporation
4. customThe product was purified by means of silica gel chromatography
5. additiona mixture of ammonia saturated methanol (2%) and methylene chloride