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Nitrogen → 4-Allyl-7-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine

HRID 1400701
Notes
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Reaction equation

HRID 1400701 reaction equation
[F:1][C:2]1[C:3]([B:12]2[O:16][C:15]([CH3:18])([CH3:17])[C:14]([CH3:20])([CH3:19])[O:13]2)=[CH:4][C:5]2[NH:10][CH2:9][CH2:8][O:7][C:6]=2[CH:11]=1.C([O-])([O-])=O.[K+].[K+].N#N.[CH2:29](Br)[CH:30]=[CH2:31]>CN(C=O)C.O>[CH2:31]([N:10]1[CH2:9][CH2:8][O:7][C:6]2[CH:11]=[C:2]([F:1])[C:3]([B:12]3[O:16][C:15]([CH3:18])([CH3:17])[C:14]([CH3:20])([CH3:19])[O:13]3)=[CH:4][C:5]1=2)[CH:30]=[CH2:29]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 947NitrogenHCID 7841Allyl bromideHCID 11430Potassium CarbonateHCID 595785667-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine

Product 1

HCID 867107524-Allyl-7-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazineYield 74.8%

Reagents, catalysts & solvents

2
HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

A solution of 7-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine (0.503 g, 1.802 mmol, Ref. WO20100130034) and K2CO3 (0.504 g, 3.65 mmol) in dry DMF (5 mL) was sparged with N2 for 5 min, then treated with allyl bromide (0.8 mL, 9.17 mmol). The reaction tube was sealed then heated (70° C.) for 22 h. The reaction was diluted with water (50 mL) and extracted into EtOAc (50 mL). The organic layer was washed with water, brine, and then dried (Na2SO4), filtered, and concentrated. The residue was purified by biotage (4 g SiO2, 5% (3 CV), 5-40% (15 CV), 40% (2 CV), EtOAc in hexanes), affording the desired product (0.430 g, 1.347 mmol, 74.8% yield) as a clear viscous oil. 1H NMR (500 MHz, CDCl3) δ 7.03 (6, J=5.7 Hz, 1H), 6.51 (d, J=9.9 Hz, 1H), 5.84-5.94 (m, 1H), 5.26-5.31 (m, 1H), 5.24 (m, 1H), 4.25-4.32 (m, 2H), 3.87 (m, 2H), 3.19-3.25 (m, 2H), 1.34 (s, 12H). LCMS (M+H)=319.7.

Workup

  1. customThe reaction tube was sealed
  2. extractionextracted into EtOAc (50 mL)
  3. washThe organic layer was washed with water, brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was purified by biotage (4 g SiO2, 5% (3 CV), 5-40% (15 CV), 40% (2 CV), EtOAc in hexanes)

Sources & evidence

ORD record
ord-db5efb35a7d24d1a91856d4ab85c911e
Source dataset
uspto-grants-2014_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08906929B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes