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Triethylamine → 4-Bromo-7-(2,2-dimethyl-propionyloxy)-2-phenyl-oxazolo[4,5-c]pyridine-6-carboxylic acid methyl ester

HRID 2388143
ノート
印刷プレビュー

反応式

HRID 2388143 の反応式
[CH3:1][O:2][C:3]([C:5]1[N:10]=[C:9]([Br:11])[C:8]2[N:12]=[C:13]([C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)[O:14][C:7]=2[C:6]=1[OH:21])=[O:4].[CH3:22][C:23]([CH3:28])([CH3:27])[C:24](Cl)=[O:25].C(N(CC)CC)C>CN(C)C1C=CN=CC=1.C(Cl)Cl.C(OCC)(=O)C>[CH3:1][O:2][C:3]([C:5]1[N:10]=[C:9]([Br:11])[C:8]2[N:12]=[C:13]([C:15]3[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=3)[O:14][C:7]=2[C:6]=1[O:21][C:24](=[O:25])[C:23]([CH3:28])([CH3:27])[CH3:22])=[O:4]
参加物実験手順後処理出典と根拠反応ノート

参加物

7

反応物 3

HCID 8471TriethylamineHCID 62493Pivaloyl chlorideHCID 866481114-Bromo-7-hydroxy-2-phenyl-oxazolo[4,5-c]pyridine-6-carboxylic acid methyl ester

生成物 1

HCID 866481124-Bromo-7-(2,2-dimethyl-propionyloxy)-2-phenyl-oxazolo[4,5-c]pyridine-6-carboxylic acid methyl ester収率 41.2%

試薬・触媒・溶媒 3

HCID 142844-(Dimethylamino)pyridine
触媒
HCID 6344Dichloromethane溶媒
HCID 8857Ethyl Acetate溶媒

実験手順

A solution of 4-bromo-7-hydroxy-2-phenyl-oxazolo[4,5-c]pyridine-6-carboxylic acid methyl ester (0.1 g, 0.286 mmol; example 3a), trimethylacetyl chloride (42.3 μL, 0.344 mmol), triethylamine (79.7 μL, 0.572 mmol), and 4-(dimethylamino)pyridine (3.5 mg, 0.03 mmol) in methylene chloride (2.5 mL) was stirred at room temperature for 2 hours. The reaction mixture was diluted with ethyl acetate and washed with saturated sodium bicarbonate solution, brine, saturated ammonium chloride solution, and brine. The organic fraction was dried over anhydrous sodium sulfate, and concentrated. The crude product was purified by flash chromatography eluting from silica gel with a gradient of 0-70% ethyl acetate in hexanes to give 51 mg of the title compound as a white solid. MS: (+) m/z 432.8, 434.8 (M+1, 79Br/81Br).

後処理

  1. washwashed with saturated sodium bicarbonate solution, brine, saturated ammonium chloride solution, and brine
  2. dry with materialThe organic fraction was dried over anhydrous sodium sulfate
  3. concentrationconcentrated
  4. customThe crude product was purified by flash chromatography
  5. washeluting from silica gel with a gradient of 0-70% ethyl acetate in hexanes

出典と根拠

ORDレコード
ord-4b193b5b530b4bdc93e9dedfdb63965f
出典データセット
uspto-grants-2012_09
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US08269008B2

反応ノート

読み込み中…

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