Sodium Carbonate → 5-Nitro-2-(2,2,6,6-tetramethyl-3,6-dihydro-2H-pyran-4-yl)-pyridine

HRID 456003

反応式

HRID 456003 の反応式
[CH3:1][C:2]1([CH3:19])[CH2:7][C:6](B2OC(C)(C)C(C)(C)O2)=[CH:5][C:4]([CH3:18])([CH3:17])[O:3]1.C([O-])([O-])=O.[Na+].[Na+].[Li+].[Cl-].Br[C:29]1[CH:34]=[CH:33][C:32]([N+:35]([O-:37])=[O:36])=[CH:31][N:30]=1>C(COC)OC.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[N+:35]([C:32]1[CH:33]=[CH:34][C:29]([C:6]2[CH2:7][C:2]([CH3:1])([CH3:19])[O:3][C:4]([CH3:17])([CH3:18])[CH:5]=2)=[N:30][CH:31]=1)([O-:37])=[O:36]

参加物

7

反応物 4

HCID 10340Sodium CarbonateHCID 782402-Bromo-5-nitropyridineHCID 433294Lithium ChlorideHCID 467380002,2,6,6-Tetramethyl-3,6-dihydro-2H-pyran-4-boronic acid pinacol ester

生成物 1

HCID 576665155-Nitro-2-(2,2,6,6-tetramethyl-3,6-dihydro-2H-pyran-4-yl)-pyridine収率 83%

試薬・触媒・溶媒 2

HCID 178418397HCID 178418397、化合物触媒HCID 80711,2-Dimethoxyethane溶媒

反応条件

温度
80 °C

実験手順

2,2,6,6-Tetramethyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyran (as prepared in the previous step) (18.5 g, 0.069 mol) was dissolved in dimethoxyethane (DME) (350 mL). The resulting solution was treated with 2 M Na2CO3 (280 mL, 0.560 mol), LiCl (5.00 g, 0.110 mol) and 2-bromo-5-nitropyridine (14.0 g, 0.060 mol). The resulting mixture was degassed by sonication for 30 min under Ar and then Pd(PPh3)4 (8.00 g, 6.90 mmol) was added and the reaction heated at 80° C. under Ar overnight. The reaction mixture was allowed to cool to RT and extracted with EtOAc (3×150 mL). The residue was purified on silica gel with 2-10% EtOAc:hexane to obtain the title compound as a pale yellow solid (15.2 g, 83%). 1H-NMR (CDCl3; 400 MHz): δ 9.40 (d, 1H, J=2.8 Hz), 8.45 (dd, 1H, J=8.8, 2.8 Hz), 7.59 (d, 1H, J=8.8 Hz), 6.90 (t, 1H, J=1.6 Hz), 2.5 (d, 1H, J=1.6 Hz), 1.40 (s, 6H), 1.34 (s, 6H).

後処理

  1. customThe resulting mixture was degassed by sonication for 30 min under Ar
  2. temperatureto cool to RT
  3. extractionextracted with EtOAc (3×150 mL)
  4. customThe residue was purified on silica gel with 2-10% EtOAc

出典と根拠

ORDレコード
ord-dd9cf3a83da04bdfa445c75036224dbb
出典データセット
uspto-grants-2013_07
特許番号
US08497376B2

関連ノート

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