Water → 4-benzyl-6-[2-cyclopropyl-5-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-benzyl]-3,4-dihydro-2H-benzo[1,4]oxazine

HRID 72617

Reaction equation

HRID 72617 reaction equation
[CH2:1]([N:8]1[C:13]2[CH:14]=[C:15]([CH2:18][C:19]3[CH:24]=[C:23]([C@H:25]4[C@H:30]([O:31][CH2:32][C:33]5[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=5)[C@@H:29]([O:39][CH2:40][C:41]5[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=5)[C@H:28]([O:47][CH2:48][C:49]5[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=5)[C@@H:27]([CH2:55][O:56][CH2:57][C:58]5[CH:63]=[CH:62][CH:61]=[CH:60][CH:59]=5)[O:26]4)[CH:22]=[CH:21][C:20]=3Br)[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.[CH:65]1(B(O)O)[CH2:67][CH2:66]1.P([O-])([O-])([O-])=O.[K+].[K+].[K+].O>C1(C)C=CC=CC=1.O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH2:1]([N:8]1[C:13]2[CH:14]=[C:15]([CH2:18][C:19]3[CH:24]=[C:23]([C@H:25]4[C@H:30]([O:31][CH2:32][C:33]5[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=5)[C@@H:29]([O:39][CH2:40][C:41]5[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=5)[C@H:28]([O:47][CH2:48][C:49]5[CH:54]=[CH:53][CH:52]=[CH:51][CH:50]=5)[C@@H:27]([CH2:55][O:56][CH2:57][C:58]5[CH:63]=[CH:62][CH:61]=[CH:60][CH:59]=5)[O:26]4)[CH:22]=[CH:21][C:20]=3[CH:65]3[CH2:67][CH2:66]3)[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

7

Reactant 4

HCID 962WaterHCID 62657Potassium Phosphate, TribasicHCID 2760897Cyclopropylboronic acidHCID 529135254-benzyl-6-[2-bromo-5-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-benzyl]-3,4-dihydro-2H-benzo[1,4]oxazine

Product 1

HCID 529135264-benzyl-6-[2-cyclopropyl-5-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-benzyl]-3,4-dihydro-2H-benzo[1,4]oxazineYield 95%

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 22272177Toluene waterSolvent

Conditions

Temperature
100 °C

Procedure

To a stirred solution of 4-benzyl-6-[2-bromo-5-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-benzyl]-3,4-dihydro-2H-benzo[1,4]oxazine (0.35 g, 0.38 mmol) in toluene:water (10:1 mixture, 10 mL) was added cyclopropylboronic acid (49.2 mg, 0.5731 mmol) tricyclohexylphosphine (26.7 mg, 0.0955 mmol), and potassium phosphate (0.28 g, 1.34 mmol). The reaction mixture was degassed for 45 min then palladium (II) acetate (8.5 mg, 0.03821 mmol) was added. After heating overnight at 100° C., the reaction mixture was cooled to room temperature and water (20 mL) was added. The resulting mixture was extracted with ethyl acetate (2×25 mL), washed with water and brine, then dried over sodium sulfate, concentrated and purified by column chromatography to furnish 4-benzyl-6-[2-cyclopropyl-5-((2S,3S,4R,5R,6R)-3,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-2-yl)-benzyl]-3,4-dihydro-2H-benzo[1,4]oxazine (317 mg). The product was taken up for the next step without characterization.

Workup

  1. customThe reaction mixture was degassed for 45 min
  2. temperaturethe reaction mixture was cooled to room temperature
  3. extractionThe resulting mixture was extracted with ethyl acetate (2×25 mL)
  4. washwashed with water and brine
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated
  7. custompurified by column chromatography

Sources & evidence

ORD record
ord-6678cb7f5c784103b1b4fdd366803d9e
Source dataset
uspto-grants-2014_09
Patent number
US08828951B2

Linked notes

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