Triethylamine → (E)-tert-butyl 3-(4-((6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylate

HRID 332857Notes

Reaction equation

Br[C:2]1[CH:19]=[CH:18][C:5]([O:6][C:7]2[C:8]3[CH:15]=[CH:14][C:13]([O:16][CH3:17])=[CH:12][C:9]=3[S:10][CH:11]=2)=[CH:4][CH:3]=1.[C:20]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])(=[O:23])[CH:21]=[CH2:22].C(N(CC)CC)C>CN(C=O)C.C(Cl)Cl.O.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>[CH3:17][O:16][C:13]1[CH:14]=[CH:15][C:8]2[C:7]([O:6][C:5]3[CH:18]=[CH:19][C:2](/[CH:22]=[CH:21]/[C:20]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])=[CH:3][CH:4]=3)=[CH:11][S:10][C:9]=2[CH:12]=1

Participants

Conditions

Temperature: 120 °C

Procedure

To a microwave vial, 3-(4-bromophenoxy)-6-methoxybenzo[b]thiophene (4 g, 11.93 mmol), tert-butyl acrylate (10.49 mL, 71.6 mmol), and Pd(PPh3)2Cl2 (1.256 g, 1.79 mmol) were suspended in DMF (12 mL) and triethylamine (8.32 mL, 59.7 mmol). The reaction was heated for 60 min at 120° C. under microwave irradiation. The reaction mixture was diluted with DCM and water. The organic layer was collected (phase separator) and concentrated to obtain the crude product. The crude material was purified by column chromatography (SiO2, 1-20% EtOAc/Heptane) to afford (E)-tert-butyl 3-(4-((6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylate (3 g, 7.84 mmol, 66% yield) as a white solid. 1H NMR (CDCl3) δ ppm=7.45-7.63 (m, 4H), 7.27-7.33 (m, 1H), 7.03-7.13 (m, 2H), 6.99 (dd, J=8.8, 2.3 Hz, 1H), 6.66 (s, 1H), 6.30 (d, J=16.2 Hz, 1H), 3.90 (s, 3H), 1.55 (s, 9H).

Workup

customThe organic layer was collected (phase separator)
concentrationconcentrated
customto obtain the crude product
customThe crude material was purified by column chromatography (SiO2, 1-20% EtOAc/Heptane)

Sources & evidence

ORD record: ord-704f0d6e2a09413886bdbbcca0d119d3
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08877801B2

Reaction notes

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