1-Bromo-2,3-difluorobenzene → 1-(2,3-Difluorophenyl)-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone

HRID 1969332Notes

Reaction equation

HRID 1969332 reaction equation
C([Mg]Cl)(C)C.[Li+].[Cl-].[F:8][C:9]1[C:14]([F:15])=[CH:13][CH:12]=[CH:11][C:10]=1Br.O1CCN([C:23](=[O:50])[CH2:24][O:25][CH:26]([CH:48]=[CH2:49])[CH2:27][O:28][C:29]([C:42]2[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=2)([C:36]2[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=2)[C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)CC1>C1COCC1>[F:8][C:9]1[C:14]([F:15])=[CH:13][CH:12]=[CH:11][C:10]=1[C:23](=[O:50])[CH2:24][O:25][CH:26]([CH:48]=[CH2:49])[CH2:27][O:28][C:29]([C:42]1[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=1)([C:30]1[CH:31]=[CH:32][CH:33]=[CH:34][CH:35]=1)[C:36]1[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=1

Participants

5

Reactant 3

HCID 27332601-Bromo-2,3-difluorobenzeneHCID 704971151-Morpholino-2-(1-(trityloxy)but-3-en-2-yloxy)ethanoneHCID 178461733HCID 178461733, compound

Product 1

HCID 704971671-(2,3-Difluorophenyl)-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Isopropylmagnesiumchloride-LiCl complex (1.30 M in THF, 155.0 mL, 0.0715 mol) under nitrogen was cooled to 0-5° C., and 2,3-difluorobromobenzene (13.8 g, 0.0715 mol, 1.50 equiv.) was added while T<10° C. After 1 h at 0-5° C., a solution of 1-morpholino-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone 14 (21.8 g, 0.048 mol, 1.0 equiv.) in THF (2.0 vols) was added while T<10° C. The reaction mixture was stirred for 2.5 hours and monitored for consumption of 1-morpholino-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone (target >97%). The reaction mixture was quenched by charging into cold sat. aq. NH4Cl (110 mL) and water (33 mL) while T<20° C. 2-Methoxy-2-methylpropane (218 mL) was added and the layers were separated. The organics were washed with sat. aq. NH4Cl (65 mL) and 18% aq. NaCl (44 mL.). The organics were concentrated under vacuum T<25° C. to a light yellow oil of ketone 15 (21.6 g).

Workup

  1. custommonitored for consumption of 1-morpholino-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone (target >97%)
  2. customThe reaction mixture was quenched
  3. customby charging into cold sat. aq. NH4Cl (110 mL) and water (33 mL) while T<20° C
  4. addition2-Methoxy-2-methylpropane (218 mL) was added
  5. customthe layers were separated
  6. washThe organics were washed with sat. aq. NH4Cl (65 mL) and 18% aq. NaCl (44 mL.)
  7. concentrationThe organics were concentrated under vacuum T<25° C. to a light yellow oil of ketone 15 (21.6 g)

Sources & evidence

ORD record
ord-6de7d7bc973047f4801a7dc0b212ef4a
Source dataset
uspto-grants-2013_04
Patent number
US08426584B2

Reaction notes

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