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Cesium carbonate → methyl (R)-7-amino-2,3,3a,4-tetrahydro-1H-benzo[b]pyrrolo[1,2-d][1,4]oxazine-6-carboxylate

HRID 715945
Notes
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Reaction equation

HRID 715945 reaction equation
[NH2:1][C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]([O:12][CH2:13][C@H:14]2[CH2:18][CH2:17][CH2:16][NH:15]2)[C:5](Br)=[CH:4][CH:3]=1.C1(P(C2C=CC=CC=2)C2C=CC3C(=CC=CC=3)C=2C2C3C(=CC=CC=3)C=CC=2P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(=O)([O-])[O-].[Cs+].[Cs+]>C1(C)C=CC=CC=1.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[NH2:1][C:2]1[C:7]([C:8]([O:10][CH3:11])=[O:9])=[C:6]2[O:12][CH2:13][C@H:14]3[CH2:18][CH2:17][CH2:16][N:15]3[C:5]2=[CH:4][CH:3]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 634876Binap, (A+-)-HCID 86712110methyl 6-amino-3-bromo-2-((R)-1-pyrrolidin-2-ylmethoxy)benzoate2×

Product 1

HCID 86712109methyl (R)-7-amino-2,3,3a,4-tetrahydro-1H-benzo[b]pyrrolo[1,2-d][1,4]oxazine-6-carboxylateYield 42.4%

Reagents, catalysts & solvents 2

HCID 167845
palladium(II) acetate
Catalyst
HCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of methyl 6-amino-3-bromo-2-((R)-1-pyrrolidin-2-ylmethoxy)benzoate (Intermediate 7, 1.65 g), palladium acetate (0.281 g), (+/−)-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene (1.56 g) and cesium carbonate (3.26 g) in toluene (40 mL) was heated at 100° C., under an atmosphere of nitrogen for 2 hours. The mixture was cooled and partitioned between ethyl acetate and water. The organic layer was dried (Na2SO4), filtered and the filtrate was concentrated in vacuo. The residue was purified by chromatography on silica, eluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-40% to give methyl (R)-7-amino-2,3,3a,4-tetrahydro-1H-benzo[b]pyrrolo[1,2-d][1,4]oxazine-6-carboxylate (0.528 g) as a dark oil.

Workup

  1. temperatureThe mixture was cooled
  2. custompartitioned between ethyl acetate and water
  3. dry with materialThe organic layer was dried (Na2SO4)
  4. filtrationfiltered
  5. concentrationthe filtrate was concentrated in vacuo
  6. customThe residue was purified by chromatography on silica
  7. washeluting with a mixture of ethyl acetate and cyclohexane with a gradient of 0-40%

Sources & evidence

ORD record
ord-e1102cbdca9b40d68f3bebddc0a5e78c
Source dataset
uspto-grants-2015_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09187494B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes