2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 3-Ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methylpyridine-3,5-dicarboxylate

HRID 1912542ノート

反応式

HRID 1912542 の反応式
[NH2:1][C:2]1[NH:3][C:4]([CH3:27])=[C:5]([C:23]([O:25][CH3:26])=[O:24])[CH:6]([C:13]2[CH:14]=[C:15]3[C:20](=[CH:21][CH:22]=2)[O:19][CH2:18][CH2:17][CH2:16]3)[C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9].C(C1C(=O)C(Cl)=C(Cl)C(=O)C=1C#N)#N>ClCCl>[NH2:1][C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[C:6]([C:13]2[CH:14]=[C:15]3[C:20](=[CH:21][CH:22]=2)[O:19][CH2:18][CH2:17][CH2:16]3)[C:5]([C:23]([O:25][CH3:26])=[O:24])=[C:4]([CH3:27])[N:3]=1

参加物

4

反応物 2

HCID 67752,3-Dichloro-5,6-dicyano-1,4-benzoquinoneHCID 712088353-Ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate

生成物 1

HCID 712092193-Ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methylpyridine-3,5-dicarboxylate収率 64.9%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

実験手順

A mixture of methyl 2-(chroman-6-ylmethylene)-3-oxobutanoate (8.27 g, 31.8 mmol), ethyl 3,3-diaminoacrylate, hydrochloride (5.29 g, 31.8 mmol) and 4-methylmorpholine (3.49 mL, 31.8 mmol) in Isopropanol (76.0 mL) was heated to 90° C. overnight. The mixture was concentrated, dissolved in ethyl acetate, washed with brine, dried over sodium sulfate, filtered and concentrated to provide crude 3-ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate which was used without further purification. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.00-6.87 (m, 3 H), 6.64-6.58 (m, 1 H), 6.20 (br. s., 2 H), 4.83-4.77 (m, 1 H), 4.15-4.05 (m, 4 H), 3.71-3.63 (m, 3 H), 2.71 (t, J=6.3 Hz, 2 H), 2.27-2.16 (m, 3 H), 1.99-1.93 (m, 2 H), 1.27-1.22 (m, 3 H); LC/MS (m/z) ES+=373.3 (M+1). A solution of crude 3-ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate in dichloromethane (DCM) (216 mL) was treated with DDQ (7.22 g, 31.8 mmol) and then stirred at ambient temperature (mixture turned dark within one minute). The mixture was filtered over Celite™. The filtrate was diluted with saturated sodium bicarbonate and the layers were separated. The aqueous phase was extracted with DCM. The combined extracts were washed with brine, dried over sodium sulfate, filtered and concentrated. The residue was purified on silica gel (0-100% hexane/EA) to afford 3-ethyl 5-methyl 2-amino-4-(chroman-6-yl)-6-methylpyridine-3,5-dicarboxylate (7.64 g, 20.63 mmol, 64.9% yield) as a brown solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 6.86 (d, 1 H), 6.81 (s, 1 H), 6.73 (d, J=8.4 Hz, 1 H), 6.23-6.02 (m, 2 H), 4.17 (t, J=4.7 Hz, 2 H), 3.99-3.77 (m, 2 H), 3.52-3.43 (m, 3 H), 2.73 (br. s., 2H), 2.45-2.35 (m, 3 H), 1.98 (br. s., 2 H), 0.83-0.67 (m, 3 H); LC/MS (m/z) ES+=371.3 (M+1).

後処理

  1. customwas used without further purification
  2. filtrationThe mixture was filtered over Celite™
  3. additionThe filtrate was diluted with saturated sodium bicarbonate
  4. customthe layers were separated
  5. extractionThe aqueous phase was extracted with DCM
  6. washThe combined extracts were washed with brine
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated
  10. customThe residue was purified on silica gel (0-100% hexane/EA)

出典と根拠

ORDレコード
ord-2b402777a9794ad5a1f7a344d9bf953e
出典データセット
uspto-grants-2013_12
特許番号
US08609653B2

反応ノート

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