Pyridine → (3AR,5R)-5-((benzyloxy)methyl)-3a,4,5,7-tetrahydro-3H-pyrano[3,4-c]isoxazole

HRID 68391

反応式

HRID 68391 の反応式
N1C=CC=CC=1.[CH2:7]([O:14][CH2:15][C@H:16]([O:20][CH2:21][CH:22]=[N:23][OH:24])[CH2:17][CH:18]=[CH2:19])[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.ClN1C(=O)CCC1=O>ClCCl.S([O-])([O-])=O.[Na+].[Na+]>[CH2:7]([O:14][CH2:15][C@@H:16]1[O:20][CH2:21][C:22]2=[N:23][O:24][CH2:19][C@@H:18]2[CH2:17]1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1

参加物

6

反応物 3

HCID 1049PyridineHCID 31398ChlorosuccinimideHCID 86640913((R)-1-benzyloxymethyl-3-butenyloxy)acetaldehyde oxime

生成物 1

HCID 57475687(3AR,5R)-5-((benzyloxy)methyl)-3a,4,5,7-tetrahydro-3H-pyrano[3,4-c]isoxazole

試薬・触媒・溶媒 2

HCID 6344Dichloromethane溶媒HCID 24437Sodium Sulfite溶媒

実験手順

Pyridine (23.1 mL, 286 mmol) was added to a solution of 2-{[(2R)-1-(benzyloxy)pent-4-en-2-yl]oxy}-N-hydroxyethanimine (C3) (35.6 g, 143 mmol) in dichloromethane (350 mL). N-Chlorosuccinimide (19.4 g, 145 mmol) was added in portions over roughly 2 hours. The reaction was stirred for 3 hours, then diluted with an aqueous solution of sodium sulfite (5 g in 100 mL water). The mixture was stirred for 20 minutes, and the aqueous layer was extracted with dichloromethane; the combined organic layers were washed with water, dried, and concentrated. Purification via silica gel chromatography (Eluent: 1:2 ethyl acetate/hexanes) afforded the product. Yield: 21.2 g, 85.7 mmol, 60%. 1H NMR (400 MHz, CDCl3) δ 7.28-7.40 (m, 5H), 4.77 (d, J=13.4 Hz, 1H), 4.55-4.65 (m, 3H), 4.22 (dd, J=13.5, 1.3 Hz, 1H), 3.79 (dd, J=11.7, 8.0 Hz, 1H), 3.69-3.76 (m, 1H), 3.57 (dd, half of ABX pattern, J=10.2, 5.9 Hz, 1H), 3.49 (dd, half of ABX pattern, J=10.2, 4.3 Hz, 1H), 3.40-3.5 (m, 1H), 2.21 (ddd, J=12.9, 6.5, 1.8 Hz, 1H), 1.57 (ddd, J=13, 12, 11 Hz, 1H).

後処理

  1. stirringThe mixture was stirred for 20 minutes
  2. extractionthe aqueous layer was extracted with dichloromethane
  3. washthe combined organic layers were washed with water
  4. customdried
  5. concentrationconcentrated
  6. customPurification via silica gel chromatography (Eluent: 1:2 ethyl acetate/hexanes)
  7. customafforded the product

出典と根拠

ORDレコード
ord-92ea649787e74abf95600df59ccc4d3c
出典データセット
uspto-grants-2014_09
特許番号
US08822456B2

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