Methyl Acrylate → 3-[4-(8,9-Dihydro-7H-benzocyclohepten-5-yl)-phenyl]-acrylic Acid Methyl Ester

HRID 584572Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:14]3[CH:15]=[CH:16][CH:17]=[CH:18][C:13]=3[CH2:12][CH2:11][CH2:10][CH:9]=2)=[CH:4][CH:3]=1.[C:19]([O:23][CH3:24])(=[O:22])[CH:20]=[CH2:21].C(N(CC)CC)C>CN(C=O)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH3:24][O:23][C:19](=[O:22])[CH:20]=[CH:21][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:14]3[CH:15]=[CH:16][CH:17]=[CH:18][C:13]=3[CH2:12][CH2:11][CH2:10][CH:9]=2)=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a solution of 9-(4-bromophenyl)-6,7-dihydro-5H-benzocycloheptene (2a, compound III, R3=H, X=Br, n=2) (12.38 g, 41 mmol) in DMF (30 mL) was added methyl acrylate (38.2 g, 444 mmol), triethylamine (29.0 g, 286 mmol), and bis(triphenylphosphine)palladium(II) chloride (7.0 g, 10.0 mmol). The mixture was placed in a pressure bottle and heated at 100° C. for 4 days. The solvent was removed under reduced pressure and the residue was chromatographed (silica gel, 7.5 to 15% EtOAc/hexanes) to give the ester (2b) as a white solid (11.4 g, 90%): 1H NMR (CDCl3) δ 7.69 (d, J=15.7 Hz, 1H), 7.45 (d, J=8.1 Hz, 2H), 7.24 (m, 5H), 6.98 (m, 1H), 6.52 (t, J=7.3 Hz, 1H), 6.43 (d, J=15.7 Hz, 1H), 3.81 (s, 3H), 2.65 (t, J=7.0 Hz, 2H), 2.17 (m, 2H), 1.98 (m, 2H); APcI m/z: 346 (M+H+CH3CN+, 100%).

Workup

customThe solvent was removed under reduced pressure
customthe residue was chromatographed (silica gel, 7.5 to 15% EtOAc/hexanes)

Sources & evidence

ORD record: ord-7521629622ba4967b8a649e4115c772a
Source dataset: uspto-grants-2005_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06927224B2

Reaction notes

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