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 1912542노트

반응식

HRID 1912542 반응식
[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

참가 물질

4

반응물 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

생성물 1

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

시약·촉매·용매 1

HCID 6344Dichloromethane용매

실험 절차

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).

후처리

  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)

출처 및 근거

ORD 기록
ord-2b402777a9794ad5a1f7a344d9bf953e
출처 데이터셋
uspto-grants-2013_12
특허 번호
US08609653B2

반응 노트

불러오는 중…