Boron trifluoride → (2S,3R,4R,5S,6R)-2-[3-(4-Benzyl-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethyl)-4-isopropyl-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triol

HRID 1695872Notes

Reaction equation

HRID 1695872 reaction equation
[CH2:1]([N:8]1[C:13]2[CH:14]=[C:15]([CH2:18][C:19]3[CH:20]=[C:21]([C:28]4(OC)[C@H:33]([OH:34])[C@@H:32]([OH:35])[C@H:31]([OH:36])[C@@H:30]([CH2:37][OH:38])[O:29]4)[CH:22]=[CH:23][C:24]=3[CH:25]([CH3:27])[CH3:26])[CH:16]=[CH:17][C:12]=2[O:11][CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([SiH](CC)CC)C.B(F)(F)F>C(#N)C.ClC(Cl)C>[CH2:1]([N:8]1[C:13]2[CH:14]=[C:15]([CH2:18][C:19]3[CH:20]=[C:21]([C@H:28]4[C@H:33]([OH:34])[C@@H:32]([OH:35])[C@H:31]([OH:36])[C@@H:30]([CH2:37][OH:38])[O:29]4)[CH:22]=[CH:23][C:24]=3[CH:25]([CH3:27])[CH3:26])[CH:16]=[CH:17][C:12]=2[O:11][CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 6356Boron trifluorideHCID 12052TriethylsilaneHCID 67115976HCID 67115976, compound

Product 1

HCID 52913629(2S,3R,4R,5S,6R)-2-[3-(4-Benzyl-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethyl)-4-isopropyl-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triolYield 91.8%

Reagents, catalysts & solvents 1

HCID 21218066Acetonitrile dichloroethaneSolvent

Conditions

Temperature
0 °C

Procedure

To a stirred solution of (3R,4S,5S,6R)-2-[3-(4-Benzyl-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethyl)-4-isopropyl-phenyl]-6-hydroxymethyl-2-methoxy-tetrahydro-pyran-3,4,5-triol (600 mg, 1.09 mmol) in acetonitrile-dichloroethane mixture (1:1 mixture, 10 mL) was added triethylsilane (0.7 mL, 4.4 mmol) and boron trifluoride diethyletharate complex (0.27 mL, 2.18 mmol) at −20° C. After stirring for 4 h at 0° C., the reaction was quenched with aq. saturated NaHCO3 solution (8 mL). The volatiles were evaporated under reduced pressure; the resulting mixture was extracted with ethyl acetate (3×20 mL). The organic layers were combined and washed with brine (5 mL), dried over sodium sulphate, concentrated to a residue which was purified by column chromatography to furnish (2S,3R,4R,5S,6R)-2-[3-(4-Benzyl-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethyl)-4-isopropyl-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triol (520 mg).

Workup

  1. customthe reaction was quenched with aq. saturated NaHCO3 solution (8 mL)
  2. customThe volatiles were evaporated under reduced pressure
  3. extractionthe resulting mixture was extracted with ethyl acetate (3×20 mL)
  4. washwashed with brine (5 mL)
  5. dry with materialdried over sodium sulphate
  6. concentrationconcentrated to a residue which
  7. customwas purified by column chromatography

Sources & evidence

ORD record
ord-ce054ba373cc4954b96038b38d3e3776
Source dataset
uspto-grants-2012_04
Patent number
US08163704B2

Reaction notes

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