反応 #442103

反応方程式

1,3-dihydro-1-(1-methylethenyl)-2H-benzimidazol-2-one

1,5-dichloropentane

sodium hydride

→

1-(5-chloropentyl)-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one

溶媒

N,N-dimethylformamide

N,N-dimethylformamide

反応条件

後処理

1. 1
   workup.ADDITIONis added dropwise, during a 2 hours-period
2. 2
   ろ過The reaction mixture is filtered over hyflo
3. 3
   その他the filtrate is evaporated
4. 4
   workup.STIRRINGthe whole is stirred with activated charcoal
5. 5
   ろ過The latter is filtered off
6. 6
   洗浄The filtrate is washed with water
7. 7
   その他dried
8. 8
   ろ過filtered
9. 9
   その他evaporated in an oil-bath at 120° C. (water-jet)

実験手順

To a stirred suspension of 3.2 parts of a sodium hydride dispersion 70% in 9 parts of N,N-dimethylformamide is added dropwise, during a 2 hours-period, a mixture of 17.4 parts of 1,3-dihydro-1-(1-methylethenyl)-2H-benzimidazol-2-one, 70.5 parts of 1,5-dichloropentane and 45 parts of N,N-dimethylformamide at 25°-30° C. Upon completion, stirring is continued for 2 hours at room temperature. The reaction mixture is filtered over hyflo and the filtrate is evaporated. The residue is taken up in 90 parts of methylbenzene and the whole is stirred with activated charcoal. The latter is filtered off. The filtrate is washed with water, dried, filtered and evaporated in an oil-bath at 120° C. (water-jet), yielding 1-(5-chloropentyl)-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one as a residue.

出典