Sodium Carbonate → 3-amino-5-fluoro-3',6'-dihydro-2'H-[2,4]bipyridinyl-1'-carboxylic acid tert-butyl ester

HRID 217271ノート

反応式

HRID 217271 の反応式
Cl[C:2]1[C:7]([NH2:8])=[CH:6][C:5]([F:9])=[CH:4][N:3]=1.[C:10]([O:14][C:15]([N:17]1[CH2:22][CH:21]=[C:20](B2OC(C)(C)C(C)(C)O2)[CH2:19][CH2:18]1)=[O:16])([CH3:13])([CH3:12])[CH3:11].C(=O)([O-])[O-].[Na+].[Na+]>O1CCOCC1.O.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[C:10]([O:14][C:15]([N:17]1[CH2:18][CH:19]=[C:20]([C:2]2[C:7]([NH2:8])=[CH:6][C:5]([F:9])=[CH:4][N:3]=2)[CH2:21][CH2:22]1)=[O:16])([CH3:13])([CH3:11])[CH3:12]

参加物

7

反応物 3

HCID 10340Sodium CarbonateHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 447548682-Chloro-5-fluoropyridin-3-amine

生成物 1

HCID 670433533-amino-5-fluoro-3',6'-dihydro-2'H-[2,4]bipyridinyl-1'-carboxylic acid tert-butyl ester収率 65.7%

試薬・触媒・溶媒 3

HCID 178418476HCID 178418476、化合物触媒HCID 962Water溶媒HCID 312751,4-Dioxane溶媒

実験手順

A degassed solution of 2-chloro-5-fluoro-3-amino-pyridine (3.5 g), 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (8.89 g) (prepared as described in WO 2006/003494) and bis(triphenylphosphine)palladium(II) chloride (0.84 g) in dioxane (157 ml) was treated with a degassed solution of sodium carbonate (7.6 g) in water (72 ml). The reaction mixture was stirred at reflux for 1 hour, cooled to ambient temperature and the solvent evaporated in vacuo. The residue was diluted with ethyl acetate, washed with water then brine, dried over sodium sulfate and concentrated in vacuo. Chromatography on silica gel (eluent: cyclohexane/ethyl acetate 8:2) afforded 3-amino-5-fluoro-3′,6′-dihydro-2′H-[2,4]bipyridinyl-1′-carboxylic acid tert-butyl ester (4.6 g) as a solid. MS (ES+) 294 (MH+), 238 (M-isoprene); 1H NMR (400 MHz, CDCl3) 1.48 (s, 9H), 2.53 (m, 2H), 3.64 (t, 2H), 3.99 (m, 2H), 4.08 (m, 2H), 5.99 (m, 1H), 6.70 (dd, 1H), 7.85 (d, 1H).

後処理

  1. temperatureat reflux for 1 hour
  2. customthe solvent evaporated in vacuo
  3. additionThe residue was diluted with ethyl acetate
  4. washwashed with water
  5. dry with materialbrine, dried over sodium sulfate
  6. concentrationconcentrated in vacuo

出典と根拠

ORDレコード
ord-18e4e3ba2ee24701889ee0cfa0c9edef
出典データセット
uspto-grants-2012_06
特許番号
US08193362B2

反応ノート

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