Boron trifluoride etherate → (2-Chloro-5-((3S,4R,5R,6R)-3,4,5-tris(benzyloxy)-6-(benzyloxymethyl)-tetrahydro-2H-pyran-2-yl)benzyloxy)triisopropylsilane

HRID 46187Notes

Reaction equation

HRID 46187 reaction equation
[CH2:1]([O:8][C@@H:9]1[C@@H:14]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C@H:13]([O:23][CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[C@@H:12]([CH2:31][O:32][CH2:33][C:34]2[CH:39]=[CH:38][CH:37]=[CH:36][CH:35]=2)[O:11][C:10]1([C:41]1[CH:46]=[CH:45][C:44]([Cl:47])=[C:43]([CH2:48][O:49][Si:50]([CH:57]([CH3:59])[CH3:58])([CH:54]([CH3:56])[CH3:55])[CH:51]([CH3:53])[CH3:52])[CH:42]=1)O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([SiH](CC)CC)C.B(F)(F)F.CCOCC>ClCCl>[Cl:47][C:44]1[CH:45]=[CH:46][C:41]([CH:10]2[C@H:9]([O:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[C@@H:14]([O:15][CH2:16][C:17]3[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=3)[C@H:13]([O:23][CH2:24][C:25]3[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=3)[C@@H:12]([CH2:31][O:32][CH2:33][C:34]3[CH:35]=[CH:36][CH:37]=[CH:38][CH:39]=3)[O:11]2)=[CH:42][C:43]=1[CH2:48][O:49][Si:50]([CH:57]([CH3:59])[CH3:58])([CH:51]([CH3:53])[CH3:52])[CH:54]([CH3:56])[CH3:55]

Participants

5

Reactant 3

HCID 8000Boron trifluoride etherateHCID 12052TriethylsilaneHCID 67287055(3R,4S,5R,6R)-3,4,5-Tris(benzyloxy)-6-(benzyloxymethyl)-2-(4-chloro-3-((triisopropylsilyloxy)methyl)phenyl)-tetrahydro-2H-pyran-2-ol

Product 1

HCID 67287190(2-Chloro-5-((3S,4R,5R,6R)-3,4,5-tris(benzyloxy)-6-(benzyloxymethyl)-tetrahydro-2H-pyran-2-yl)benzyloxy)triisopropylsilane

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
-10 °C

Procedure

To a stirred −50° C. solution of (3R,4S,5R,6R)-3,4,5-tris(benzyloxy)-6-(benzyloxymethyl)-2-(4-chloro-3-((triisopropylsilyloxy)methyl)phenyl)tetra-hydro-2H-pyran-2-ol (198 mmol) from Step 4 in dichloromethane (500 mL) was added triethylsilane (63 mL, 396 mmol) followed by boron trifluoride diethyl etherate (50 mL, 396 mmol) at a rate such that the reaction temperature was maintained between −40 and −50° C. The solution was allowed to warm to −10° C. over 2 h prior to quenching with saturated potassium carbonate solution. After removal of organic volatiles under reduced pressure, the residue was partitioned between ethyl acetate and water. Following extraction of the aqueous layer with ethyl acetate, the combined organic layers were washed with water prior to drying over magnesium sulfate. Filtration and concentration under reduced pressure yielded the title compound as a yellow oil which was used without further purification.

Workup

  1. temperaturewas maintained between −40 and −50° C
  2. customto quenching with saturated potassium carbonate solution
  3. customAfter removal of organic volatiles under reduced pressure
  4. customthe residue was partitioned between ethyl acetate and water
  5. extractionextraction of the aqueous layer with ethyl acetate
  6. washthe combined organic layers were washed with water
  7. dry with materialto drying over magnesium sulfate
  8. filtrationFiltration and concentration under reduced pressure

Sources & evidence

ORD record
ord-397203220aa746e9b261b147a0ed6f68
Source dataset
uspto-grants-2013_09
Patent number
US08541380B2

Reaction notes

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