P-Xylene → 2-[4-(Acetyloxy)-3-fluorophenyl]-7-vinyl-1,3-benzoxazol-5-yl acetate

HRID 491736

Reaction equation

[C:1]([O:4][C:5]1[CH:10]=[CH:9][C:8]([C:11]2[O:12][C:13]3[C:19](Br)=[CH:18][C:17]([O:21][C:22](=[O:24])[CH3:23])=[CH:16][C:14]=3[N:15]=2)=[CH:7][C:6]=1[F:25])(=[O:3])[CH3:2].[CH2:26]([Sn](CCCC)(CCCC)C=C)[CH2:27]CC.CC1C=CC(C)=CC=1>C(OCC)C.CC1C=CC=CC=1[P](C1C=CC=CC=1C)([Pd](Cl)(Cl)[P](C1=C(C)C=CC=C1)(C1C=CC=CC=1C)C1C=CC=CC=1C)C1C=CC=CC=1C>[C:22]([O:21][C:17]1[CH:18]=[C:19]([CH:26]=[CH2:27])[C:13]2[O:12][C:11]([C:8]3[CH:9]=[CH:10][C:5]([O:4][C:1](=[O:3])[CH3:2])=[C:6]([F:25])[CH:7]=3)=[N:15][C:14]=2[CH:16]=1)(=[O:24])[CH3:23]

Participants

Conditions

Temperature: 130 °C

Procedure

Dichlorobis(tri-o-tolylphosphine)palladium (II) (46 mg, 0.06 mmol) was added into a mixture 4-[5-(acetyloxy)-7-bromo-1,3-benzoxazol-2-yl]-2-fluorophenyl acetate (0.8 g, 1.98 mmol), tributyl(vinyl)tin (0.9 g, 2.8 mmol) and p-xylene (9 mL). The reaction mixture was stirred at 130° C. for 5 h, cooled to room temperature, diluted with ethyl ether (10 mL) and treated with activated carbon. The mixture was filtered through MgSO4 and concentrated. Purification by flash chromatography (hexanes/EtOAc 5/1) gave a white solid (0.4 g, 56% yield, m.p. 154-156° C.); MS m/e 356 (M+H)+.

Workup

temperaturecooled to room temperature
additiontreated with activated carbon
filtrationThe mixture was filtered through MgSO4
concentrationconcentrated
customPurification by flash chromatography (hexanes/EtOAc 5/1)

Sources & evidence

ORD record: ord-129054d6c5d94575863a176794af3d49
Source dataset: uspto-grants-2009_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07531564B2

Linked notes

Loading…