Triethylamine → tert-Butyl 3-(5-(benzyloxy)-2-((1E)-3-(benzyloxy)-3-oxoprop-1-en-1-yl)phenyl)-5-(2-tert-butoxy-2-oxoethyl)-4,5-dihydro-1,2-oxazole-5-carboxylate

HRID 1486891Notes

Reaction equation

HRID 1486891 reaction equation
[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12](Br)=[C:13]([C:15]2[CH2:19][C:18]([CH2:27][C:28]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29])([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[O:17][N:16]=2)[CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:36]([O:40][CH2:41][C:42]1[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=1)(=[O:39])[CH:37]=[CH2:38].CC1C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C.C(N(CC)CC)C>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.O.CN(C=O)C>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12](/[CH:38]=[CH:37]/[C:36]([O:40][CH2:41][C:42]2[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=2)=[O:39])=[C:13]([C:15]2[CH2:19][C:18]([CH2:27][C:28]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29])([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[O:17][N:16]=2)[CH:14]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

8

Reactant 4

HCID 8471TriethylamineHCID 75617Benzyl acrylateHCID 80271Tri-o-tolylphosphineHCID 118292816tert-Butyl 3-(5-(benzyloxy)-2-bromophenyl)-5-(2-tert-butoxy-2-oxoethyl)-4,5-dihydro-1,2-oxazole-5-carboxylate

Product 1

HCID 118292836tert-Butyl 3-(5-(benzyloxy)-2-((1E)-3-(benzyloxy)-3-oxoprop-1-en-1-yl)phenyl)-5-(2-tert-butoxy-2-oxoethyl)-4,5-dihydro-1,2-oxazole-5-carboxylateYield 22.6%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

A mixture of tert-butyl 3-(5-(benzyloxy)-2-bromophenyl)-5-(2-tert-butoxy-2-oxoethyl)-4,5-dihydro-1,2-oxazole-5-carboxylate (1.00 g), benzyl acrylate (1.484 g), palladium acetate (0.021 g), tris(2-methylphenyl)phosphine (0.084 g), triethylamine (0.765 mL), and DMF (10 mL) was stirred at 100 C for 2 days in an argon atmosphere. To the reaction mixture, water was added, followed by extraction with ethyl acetate. The extract was washed with brine and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to obtain the title compound (0.260 g).

Workup

  1. extractionfollowed by extraction with ethyl acetate
  2. washThe extract was washed with brine
  3. dry with materialdried over anhydrous magnesium sulfate
  4. distillationthe solvent was distilled off under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane)

Sources & evidence

ORD record
ord-c789f09889e6442ba55d7488afaa56f6
Source dataset
uspto-grants-2016_08
Patent number
US09428470B2

Reaction notes

Loading…