反应详情

A solution of 1-amino-4-[4-(2-methoxyphenyl)-1-piperazinyl]-2-butyne (13.4 g) in tetrahydrofuran (150 ml) was added dropwise over 45 mins to a suspension of lithium aluminum hydride (3.91 g) in tetrahydrofuran (500 ml), while the reaction temperature was maintained below 5° C. The reaction mixture was allowed to warm to room temperature and was stirred at room temperature for 20 hrs. Water (3.9 ml), 15% aqueous sodium hydroxide (3.9 ml) and water (12 ml) were added sequentially, while the reaction temperature was kept below 30° C. The precipitate was filtered through a bed of celite, washed three times with diethyl ether (100 ml), filtered, and the filtrate was concentrated. Recrystallization of the residue from hexane gave 7.31 g (54%) of product, mp 63°-67° C.

1. temperaturewas maintained below 5° C
2. customwas kept below 30° C
3. filtrationThe precipitate was filtered through a bed of celite
4. washwashed three times with diethyl ether (100 ml)
5. filtrationfiltered
6. concentrationthe filtrate was concentrated
7. customRecrystallization of the residue from hexane