反应详情

温度

100 °C

A mixture of 3.81 g (26.8 mmol) of (7R,8aS)-7-hydroxy-1,2,3,4,6,7,8,8a-octahydro-pyrrolo[1,2-a]pyrazine (Preparation 6, Step A), 19.8 g (134 mmol) of 2,5-dichloropyridine, 7.10 g (67.0 mmol) of sodium carbonate and 275 mL of isoamyl alcohol was heated at reflux for 72 h. The mixture was cooled to about 100° C., filtered hot, and the filtrate concentrated in vacuo. Purification of the residue by flash silica gel chromatography with 9:1 chloroform:methanol gave 0.63 g (9%) of the title compound of sufficient purity for use in subsequent reactions. m/z (MH+) 254.

1. temperaturewas heated
2. temperatureat reflux for 72 h
3. filtrationfiltered hot
4. concentrationthe filtrate concentrated in vacuo
5. customPurification of the residue by flash silica gel chromatography with 9:1 chloroform