Benzyl Bromide → 3-Benzyl-5-[1-(2-fluoro-4-nitrophenyl)-4-piperidyl]-2,3-dihydro-1,3,4-oxadiazol-2-one

HRID 515420ノート

反応式

HRID 515420 の反応式
[F:1][C:2]1[CH:7]=[C:6]([N+:8]([O-:10])=[O:9])[CH:5]=[CH:4][C:3]=1[N:11]1[CH2:16][CH2:15][CH:14]([C:17]2[O:21][C:20](=[O:22])[NH:19][N:18]=2)[CH2:13][CH2:12]1.[C:23]1([CH2:29]Br)[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[CH2:29]([N:19]1[N:18]=[C:17]([CH:14]2[CH2:15][CH2:16][N:11]([C:3]3[CH:4]=[CH:5][C:6]([N+:8]([O-:10])=[O:9])=[CH:7][C:2]=3[F:1])[CH2:12][CH2:13]2)[O:21][C:20]1=[O:22])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1

参加物

5

反応物 3

HCID 7498Benzyl BromideHCID 11430Potassium CarbonateHCID 896509215-[1-(2-Fluoro-4-nitrophenyl)-4-piperidyl]-2,3-dihydro-1,3,4-oxadiazol-2-one

生成物 1

HCID 896510683-Benzyl-5-[1-(2-fluoro-4-nitrophenyl)-4-piperidyl]-2,3-dihydro-1,3,4-oxadiazol-2-one収率 381.5%

試薬・触媒・溶媒 1

HCID 6228Dimethylformamide溶媒

実験手順

5-[1-(2-Fluoro-4-nitrophenyl)-4-piperidyl]-2,3-dihydro-1,3,4-oxadiazol-2-one (5b, 1.23 g, 4 mmol) on reacting with C6H5CH2Br (0.82 g, 1 mmol) in DMF in the presence of base K2CO3 (1.38 g, 10 mmol) at room temperature (27° C.) for 10 h, after completion of the reaction, reaction mixture is poured into ice water and extracted into chloroform finally purification by column chromatography to afford pure compound 3-benzyl-5-[1-(2-fluoro-4-nitrophenyl)-4-piperidyl]-2,3-dihydro-1,3,4-oxadiazol-2-one (6f, 1.52 g, 96%). Nitro compound (6f, 1.59 g, 4 mmol) on reduction with SnCl2.2H2O (2.71 g, 12 mmol) in methanol and refluxed at 65° C. for 4 h, after completion of reaction methanol is evaporated under vacuum and to this saturated sodium bicarbonate solution is added to quench the excess stannous chloride and filtered through celite bed and purified in silica column (60-120) to afforded pure compound 5-[1-(4-amino-2-fluorophenyl)-4-piperidyl]-3-benzyl-2,3-dihydro-1,3,4-oxadiazol-2-one (7 h, 1.26 g, 86%). To a stirred solution of 5-nitro2-furanoic acid in DMF add. HOBT (Hydroxybenzotriazole) (0.14 g, 1 mmol), EDCI (1-Ethyl-3-(3-dimethyl aminopropyl)carbodi imide)) (0.19 g, 1 mmol) and amine compound (7 h, 0.36 g, 1 mmol) and stirred for 2 h at room temperature (27° C.), after completion of the reaction, reaction mixture is poured into ice water and extracted into chloroform finally purification by column chromatography using ethyl acetate-hexane (7:3) as eluant to afford pure compound N2-4-[4-(4-benzyl-5-oxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)piperi dino]-3-fluorophenyl-5-nitro-2-furamide (8 h, 430 mg, 85%).

後処理

  1. custom(27° C.)
  2. customfor 10 h
  3. customafter completion of the reaction, reaction mixture
  4. extractionextracted into chloroform finally purification by column chromatography

出典と根拠

ORDレコード
ord-2f916f63c140466684444e6671ccaff4
出典データセット
uspto-grants-2015_08
特許番号
US09108960B2

反応ノート

読み込み中…