3-(4,5-Dibromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine → 3-(4-Bromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine

HRID 1432612ノート

反応式

HRID 1432612 の反応式
[Br:1][C:2]1[C:3]([CH3:24])=[C:4]([C:8]2[N:12]3[N:13]=[C:14]([CH3:22])[CH:15]=[C:16]([CH:17]([CH2:20][CH3:21])[CH2:18][CH3:19])[C:11]3=[N:10][C:9]=2[CH3:23])[S:5][C:6]=1Br.[Li]CCCC>C1COCC1>[Br:1][C:2]1[C:3]([CH3:24])=[C:4]([C:8]2[N:12]3[N:13]=[C:14]([CH3:22])[CH:15]=[C:16]([CH:17]([CH2:20][CH3:21])[CH2:18][CH3:19])[C:11]3=[N:10][C:9]=2[CH3:23])[S:5][CH:6]=1

参加物

4

反応物 2

HCID 579330673-(4,5-Dibromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazineHCID 178418339Butyllithium

生成物 1

HCID 579329703-(4-Bromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine収率 31%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

To a −78° C. solution of 3-(4,5-dibromo-3-methyl-thiophen-2-yl)-8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine (0.22 g, 0.47 mmol) and THF (3 mL) is added 1.6 M n-BuLi (0.31 mL, 0.49 mmol). After 20 minutes the solution is quenched with water (1 mL), warmed to ambient temperature, diluted with EtOAc (30 mL), washed with brine (30 mL), dried over MgSO4, filtered and concentrated. The residue is purified by ISCO (5%-10% EtOAc gradient) furnish the title compound (0.056 g, 0.14 mmol, 31%). 1H NMR (CDCl3) δ 0.87 (t, J=7.5 Hz, 6H), 1.73-1.93 (m, 4H), 2.09 (s, 3H), 2.44 (s, 3H), 2.49 (s, 3H), 3.27-3.36 (m, 1H), 6.68 (s, 1H), 7.44 (s, 1H). LC/MS (m/z): calcd. for C18H22BrN3S (M+H)+: 392.2; found: 392.3.

後処理

  1. customAfter 20 minutes the solution is quenched with water (1 mL)
  2. additiondiluted with EtOAc (30 mL)
  3. washwashed with brine (30 mL)
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue is purified by ISCO (5%-10% EtOAc gradient)

出典と根拠

ORDレコード
ord-5b49310781f24e329a2b78a9fed3a642
出典データセット
uspto-grants-2009_11
特許番号
US07612067B2

反応ノート

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