Ethyl Acetate → HCID 67084795、化合物

HRID 475662

反応式

HRID 475662 の反応式
[C:1]([O:4][C@@H:5]1[C@@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@@H:8]([CH2:19][O:20][C:21](=[O:23])[CH3:22])[O:7][C@@H:6]1Br)(=[O:3])[CH3:2].[C:25]1([S:31]([O-:34])(=[O:33])=[S:32])[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1.[Na+].C(OCC)(=O)C>C(#N)C.[Br-].C([N+](CCCC)(CCCC)CCCC)CCC>[C:25]1([S:31]([O:34][C@@H:6]2[O:7][C@H:8]([CH2:19][O:20][C:21](=[O:23])[CH3:22])[C@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@H:5]2[O:4][C:1](=[O:3])[CH3:2])(=[O:33])=[S:32])[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1

参加物

6

反応物 3

HCID 8857Ethyl AcetateHCID 2734143alpha-AcetobromogalactoseHCID 4192832Benzenethiosulfonic acid

生成物 1

HCID 67084795HCID 67084795、化合物収率 67.4%

試薬・触媒・溶媒 2

HCID 74236Tetrabutylammonium Bromide触媒HCID 6342Acetonitrile溶媒

反応条件

温度
70 °C

実験手順

2,3,4,6-Tetra-O-acetyl-α-galactopyranosyl bromide (2.0 g, 5 mmol) was dissolved in anhydrous acetonitrile (80 mL). To this sodium phenylthiosulfonate (2.02 g, 10.3 mmol) and tetrabutylammonium bromide (160 mg, 0.5 mmol) were added. The resulting mixture was stirred under argon at 70° C. After a 5 h period, t.l.c. (petrol:ethyl acetate, 1:1) indicated the formation of a product (Rf 0.4) with complete consumption of the starting material (Rf 0.6). The solution was concentrated in vacuo. The crude oil was partitioned between DCM (50 mL) and water (50 mL), and the aqueous layer re-extracted with DCM (2×50 mL). The combined organics were washed with brine (100 mL), dried (MgSO4), filtered and concentrated in vacuo. The residue was purified by flash column chromatography (petrol:ethyl acetate, 2:1) to afford the title product (1.7 g, 65%, 2 steps) as a white crystalline solid; mp 53-54° C.; [α]D27+24.2 (c, 1.0 in CHCl3); δH (400 MHz, CDCl3) 1.98, 2.03, 2.06, 2.11 (4×3H, 4×s, 4×OAc), 3.85 (1H, dd, J5,6 8.8 Hz, J6,6′ 14.0 Hz, H-6), 3.95-4.00 (2H, m, H-5, H-6), 5.11 (1H, dd, J2,3 9.7 Hz, J3,4 3.3 Hz, H-3), 5.23 (1H, at, J10.3 Hz, H-2), 5.25 (1H, d, J1,2 10.2 Hz, H-1), 5.43 (1H, dd, J3,4 3.6 Hz, J4,5 1.0 Hz, H-4), 7.54-7.68 (3H, m, Ar—H), 7.93-7.97 (2H, m, Ar—H).

後処理

  1. customwith complete consumption of the starting material (Rf 0.6)
  2. concentrationThe solution was concentrated in vacuo
  3. customThe crude oil was partitioned between DCM (50 mL) and water (50 mL)
  4. extractionthe aqueous layer re-extracted with DCM (2×50 mL)
  5. washThe combined organics were washed with brine (100 mL)
  6. dry with materialdried (MgSO4)
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customThe residue was purified by flash column chromatography (petrol:ethyl acetate, 2:1)

出典と根拠

ORDレコード
ord-9be9341264ba4ff2af741b983e7ecb7b
出典データセット
uspto-grants-2014_01
特許番号
US08637578B2

関連ノート

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