反应详情

To a stirred solution of 21.6 g of N,N-dibenzyl-N'-(2-methoxyphenyl)-ethylenediamine in 400 ml methylene chloride was added 12.9 g of sodium carbonate. To this mixture, a solution of 8.42 g of chloroacetylchloride in 100 ml methylene chloride was added dropwise over 30 minutes and stirred for 1 hour. Water (500 ml) was added, the organic phase separated, washed with water, dried over magnesium sulfate and evaporated under reduced pressure. The resulting residue (27.9 g) in a flask was immersed in a 180° oil bath and the formed benzylchloride removed by distillation. The crude material was chromatrographed on 250 g silica gel using ether for elution. The appropriate fractions were evaporated to dryness and the solid recrystallized from isopropylether to yield 11.0 g 4-benzyl-1-(2-methoxyphenyl)-2-piperazinone in the form of yellowish crystals, mp 109°-111°, pure by TLC (ether on silica gel).

1. customthe organic phase separated
2. washwashed with water
3. dry with materialdried over magnesium sulfate
4. customevaporated under reduced pressure
5. customThe resulting residue (27.9 g) in a flask was immersed in a 180°
6. customoil bath and the formed benzylchloride removed by distillation
7. washfor elution
8. customThe appropriate fractions were evaporated to dryness
9. customthe solid recrystallized from isopropylether