Tetrahydrofuran → Ethyl 4-((tert-butoxycarbonyl)amino)-2-(2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-2-oxoethyl)-3-oxobutanoate

HRID 1056203ノート

反応式

HRID 1056203 の反応式
[C:1]([O:5][C:6]([NH:8][CH2:9][C:10](=[O:17])[CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13])=[O:7])([CH3:4])([CH3:3])[CH3:2].C([O-])([O-])=O.[K+].[K+].Br[CH2:25][C:26]([C:28]1[CH:37]=[CH:36][CH:35]=[C:34]2[C:29]=1[N:30]=[C:31]([NH:39][C:40]([CH3:43])([CH3:42])[CH3:41])[C:32]([CH3:38])=[N:33]2)=[O:27].C1COCC1>[NH4+].[Cl-].CCO>[C:1]([O:5][C:6]([NH:8][CH2:9][C:10](=[O:17])[CH:11]([CH2:25][C:26]([C:28]1[CH:37]=[CH:36][CH:35]=[C:34]2[C:29]=1[N:30]=[C:31]([NH:39][C:40]([CH3:43])([CH3:42])[CH3:41])[C:32]([CH3:38])=[N:33]2)=[O:27])[C:12]([O:14][CH2:15][CH3:16])=[O:13])=[O:7])([CH3:3])([CH3:4])[CH3:2]

参加物

7

反応物 4

HCID 8028TetrahydrofuranHCID 11430Potassium CarbonateHCID 111285644-((tert-Butoxycarbonyl)amino)-3-oxobutanoic acid ethyl esterHCID 897821422-Bromo-1-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)ethanone

生成物 1

HCID 89782058Ethyl 4-((tert-butoxycarbonyl)amino)-2-(2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-2-oxoethyl)-3-oxobutanoate

試薬・触媒・溶媒 2

HCID 702Ethanol溶媒HCID 25517Ammonium Chloride溶媒

実験手順

To a 25-mL round-bottomed flask was added ethyl 4-((tert-butoxycarbonyl)amino)-3-oxobutanoate (601) (0.47 g, 1.91 mmol), K2CO3 (0.41 g, 2.97 mmol), 2-bromo-1-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)ethanone (606) (0.40 g, 1.19 mmol), THF (3 mL), and EtOH (3 mL). The reaction mixture was stirred at RT for 16 h. The reaction mixture was diluted with sat NH4Cl (5 mL) and extracted with EtOAc (10 mL). The organic extract was washed with water (5 mL), dried over Na2SO4 and concentrated. Ethyl 4-((tert-butoxycarbonyl)amino)-2-(2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-2-oxoethyl)-3-oxobutanoate (334a) was obtained as a light yellow oil and used without further purification. m/z (ESI, +ve) 501.3 (M+H)+. To a 15-mL glass tube was added ethyl 4-((tert-butoxycarbonyl)amino)-2-(2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-2-oxoethyl)-3-oxobutanoate (334a), crude from previous step, NH4OAc (0.36 g, 4.71 mmol), EtOH (2 mL), and AcOH (1 mL). The tube was sealed and heated at 50° C. for 3 h. The reaction mixture was cooled to RT and was concentrated to half of its volume. The mixture was diluted with EtOAc (10 mL) and water (5 mL). The organic extract was washed with NaOH (1N, 5 mL), water (5 mL), brine (5 mL), dried over Na2SO4, and concentrated. The crude material was absorbed onto a plug of silica gel and purified by chromatography through a Redi-Sep pre-packed silica gel column (24 g), eluting with a gradient of 0% to 30% EtOAc in hexanes to give ethyl 2-(((tert-butoxycarbonyl)amino)methyl)-5-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-1H-pyrrole-3-carboxylate (334b) (0.33 g, 59% yield) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 11.64 (br. s., 1H), 7.82 (dd, J=1.17, 7.43 Hz, 1H), 7.58-7.64 (m, 1H), 7.41 (d, J=2.74 Hz, 1H), 7.35 (s, 1H), 6.94 (br. s., 1H), 4.53 (d, J=5.28 Hz, 2H), 4.21 (q, J=7.04 Hz, 2H), 2.56 (s, 3H), 1.58 (s, 9H), 1.39 (s, 9H), 1.30 (t, J=7.10 Hz, 3H). m/z (ESI, +ve) 482.2 (M+H)+.

後処理

  1. extractionextracted with EtOAc (10 mL)
  2. extractionThe organic extract
  3. washwas washed with water (5 mL)
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated

出典と根拠

ORDレコード
ord-1dbe07fe666441acb037dcd185386cae
出典データセット
uspto-grants-2016_07
特許番号
US09394297B2

反応ノート

読み込み中…