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Sodium hydride → (S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

HRID 625568
ノート
印刷プレビュー

反応式

HRID 625568 の反応式
[H-].[Na+].[Br:3][C:4]1[N:9]=[C:8]2[NH:10][C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[N:12][C:7]2=[N:6][CH:5]=1.[CH3:25][Si:26]([CH2:29][CH2:30][O:31][CH2:32]Cl)([CH3:28])[CH3:27]>CN(C=O)C.O.CCOC(C)=O>[Br:3][C:4]1[N:9]=[C:8]2[N:10]=[C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])[N:12]([CH2:32][O:31][CH2:30][CH2:29][Si:26]([CH3:28])([CH3:27])[CH3:25])[C:7]2=[N:6][CH:5]=1.[Br:3][C:4]1[N:9]=[C:8]2[N:10]([CH2:32][O:31][CH2:30][CH2:29][Si:26]([CH3:28])([CH3:27])[CH3:25])[C:11]([C@@H:13]3[CH2:17][CH2:16][CH2:15][N:14]3[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=[N:12][C:7]2=[N:6][CH:5]=1
参加物実験手順後処理出典と根拠反応ノート

参加物

8

反応物 3

HCID 24758Sodium hydrideHCID 27242712-Chloromethyl 2-(trimethylsilyl)ethyl etherHCID 58498842(S)-tert-butyl 2-(6-bromo-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

生成物 2

HCID 58498762(S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate
HCID 58498888
(S)-tert-butyl 2-(5-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate

試薬・触媒・溶媒 3

HCID 962Water溶媒HCID 6228Dimethylformamide溶媒HCID 8857Ethyl Acetate溶媒

実験手順

A 60% dispersion of NaH (75 mg, 1.9 mmol) was added to a stirred solution of (S)-tert-butyl 2-(6-bromo-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (627 mg, 1.70 mmol) in DMF (15 mL) and the reaction was stirred for 1.5 h at room temperature. Then SEM-Cl (0.30 mL, 1.7 mmol) was added and the reaction was stirred overnight. The reaction was diluted with water (˜30 mL) and EtOAc (˜35 mL), the layers were separated and the organic layer was washed with brine (30 mL), dried (MgSO4), filtered and concentrated. The crude yellow oil was purified by flash chromatography (40 g SiO2, 20-30% EtOAc/hexanes) to yield (S)-tert-butyl 2-(5-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (421 mg) as a clear colorless oil and (S)-tert-butyl 2-(6-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazo[4,5-b]pyrazin-2-yl)pyrrolidine-1-carboxylate (345 mg) as a clear colorless oil. The absolute regiochemistry of the SEM group was not established unambiguously, the names (and structures) may be exchanged in these intermediates.

後処理

  1. stirringthe reaction was stirred overnight
  2. customthe layers were separated
  3. washthe organic layer was washed with brine (30 mL)
  4. dry with materialdried (MgSO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude yellow oil was purified by flash chromatography (40 g SiO2, 20-30% EtOAc/hexanes)

出典と根拠

ORDレコード
ord-9d1b0109f8864e65b4cfad2411425e82
出典データセット
uspto-grants-2016_04
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US09303007B2

反応ノート

読み込み中…

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