Benzyl Bromide → 1-Benzyl-4-(1,3-diethyl-5-methyl-pyrazol-4-yl)-1,2,3,6-tetrahydropyridine

HRID 1245588노트

반응식

HRID 1245588 반응식
[CH2:1]([N:3]1[C:7]([CH3:8])=[C:6]([C:9]2[CH:14]=[CH:13][N:12]=[CH:11][CH:10]=2)[C:5]([CH2:15][CH3:16])=[N:4]1)[CH3:2].[CH2:17](Br)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.[BH4-].[Na+]>CO>[CH2:17]([N:12]1[CH2:13][CH:14]=[C:9]([C:6]2[C:5]([CH2:15][CH3:16])=[N:4][N:3]([CH2:1][CH3:2])[C:7]=2[CH3:8])[CH2:10][CH2:11]1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1

참가 물질

5

반응물 3

HCID 7498Benzyl BromideHCID 4311764Sodium borohydrideHCID 219127864-(1,3-Diethyl-5-methyl-1H-pyrazol-4-yl)pyridine

생성물 1

HCID 219127201-Benzyl-4-(1,3-diethyl-5-methyl-pyrazol-4-yl)-1,2,3,6-tetrahydropyridine

시약·촉매·용매 1

HCID 887Methanol용매

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온도
0 °C

실험 절차

A solution of 7.55 g (35.0 mmol) of 1,3-diethyl-4-(4-pyridyl)-5-methylpyrazole (from Step E) and 4.20 mL (35.0 mmol) of benzyl bromide in 50 mL of MeOH was heated at reflux for 30 min. The mixture was cooled to 0° C. and treated with 2.65 g (70.0 mmol) of sodium borohydride in portions so as to maintain the internal at ˜0° C. The resulting mixture was stirred cold for 30 min, then concentrated. The residue was partitioned between 300 mL of CH2Cl2 and 150 mL of 1.0 N NaOH and the layers were separated. The organic layer was dried over MgSO4. The organic layer was extracted with 300 mL of ether; the extract was dried over MgSO4. The organic layers were combined and concentrated. Chromatography on a Biotage 75L using 9:1 v/v heptane/acetone as the eluant affforded the title compound. 1H-NMR (400 MHz) δ 1.19 (t, J=7.6, 3H), 1.37 (t, J=7.6, 3H), 2.17 (s, 3H), 2.31–2.35 (m, 2H), 2.58 (q, J=7.6, 2H), 2.66 (t, J=5.6, 2H), 3.13 (app q, J=2.8, 2H), 3.65 (s, 2H), 4.01 (q, J=7.6, 2H), 5.46–5.48 (m, 1H), 7.26–7.39.

후처리

  1. temperatureat reflux for 30 min
  2. temperatureto maintain the internal at ˜0° C
  3. concentrationconcentrated
  4. customThe residue was partitioned between 300 mL of CH2Cl2 and 150 mL of 1.0 N NaOH
  5. customthe layers were separated
  6. dry with materialThe organic layer was dried over MgSO4
  7. extractionThe organic layer was extracted with 300 mL of ether
  8. dry with materialthe extract was dried over MgSO4
  9. concentrationconcentrated

출처 및 근거

ORD 기록
ord-f0b61cc68bc449ad8c6be54ebaad47ac
출처 데이터셋
uspto-grants-2006_10
특허 번호
US07125887B2

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