Ethanolamine → Methyl 4-butyl-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate

HRID 349008

反応式

HRID 349008 の反応式
[CH2:1]([N:5]1[C:10]2[CH:11]=[C:12]([C:15]([O:17][CH3:18])=[O:16])[CH:13]=[CH:14][C:9]=2[O:8][CH2:7][C:6]1=O)[CH2:2][CH2:3][CH3:4].B1C2CCCC1CCC2.C(CN)O>O1CCCC1>[CH2:1]([N:5]1[C:10]2[CH:11]=[C:12]([C:15]([O:17][CH3:18])=[O:16])[CH:13]=[CH:14][C:9]=2[O:8][CH2:7][CH2:6]1)[CH2:2][CH2:3][CH3:4]

参加物

5

反応物 3

HCID 700EthanolamineHCID 789669-Borabicyclo(3.3.1)nonaneHCID 21086200Methyl 4-butyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate

生成物 1

HCID 21086198Methyl 4-butyl-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate収率 80.1%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒

実験手順

A solution of methyl 4-butyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate (800 mg) and 9-BBN (1.6 g) in tetrahydrofuran (13 mL) was refluxed for 1.5 h. The mixture was cooled to room temperature, ethanolamine (0.4 mL) was added, and the resulting solution was concentrated under reduced pressure. The residue was washed with hexanes, filtered, and the filtrate was concentrated under reduced pressure. Purification by flash column chromatography (silica, 25% ethyl acetate/hexanes) afforded 607 mg of the title compound: 1H NMR (300 MHz, DMSO-d6) δ 7.21, 7.16, 6.75, 4.24–4.21, 3.78, 3.34–3.24, 1.55–1.47, 1.38–1.30, 0.95–0.90.

後処理

  1. concentrationthe resulting solution was concentrated under reduced pressure
  2. washThe residue was washed with hexanes
  3. filtrationfiltered
  4. concentrationthe filtrate was concentrated under reduced pressure
  5. customPurification by flash column chromatography (silica, 25% ethyl acetate/hexanes)

出典と根拠

ORDレコード
ord-95f9ca50e434407a8f6c89eeb4c2978d
出典データセット
uspto-grants-2007_02
特許番号
US07176242B2

関連ノート

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