Triethylamine → 7-bromo-3-(1-hydroxyethyl)-1H-isochromen-1-one

HRID 1056866Notes

Reaction equation

[Br:1][C:2]1[CH:3]=[CH:4][C:5](I)=[C:6]([CH:10]=1)[C:7]([OH:9])=[O:8].[CH3:12][CH:13]([OH:16])[C:14]#[CH:15].CCN(CC)CC>[Cl-].[Cl-].[Zn+2].C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CN(C=O)C>[Br:1][C:2]1[CH:10]=[C:6]2[C:5]([CH:15]=[C:14]([CH:13]([OH:16])[CH3:12])[O:9][C:7]2=[O:8])=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 80 °C

Procedure

Part 2, Step A: A mixture of 5-bromo-2-iodobenzoic acid (12.6 g, 38.5 mmol), but-3-yn-2-ol (3.1 mL, 2.96 g, 42.4 mmol), ZnCl2 (5.2 g, 38.5 mmol), Pd(Ph3P)4 (2.23 g, 1.9 mmol), Et3N (16.0 mL, 11.7 g, 115.5 mmol) and DMF (80 mL) was stirred under argon at 80° C. for 2 hours. After removal of the volatiles under vacuum, the residue was chromatographed (silica gel, ethyl acetate in hexanes, 0-100%) to provide the intermediate 7-bromo-3-(1-hydroxyethyl)-1H-isochromen-1-one as a brown oil (7.5 g, 72%). 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 8.38-8.45 (1H, m), 7.81 (1H, dd, J=8.35, 2.05 Hz), 7.32 (1H, d, J=8.51 Hz), 6.52-6.59 (1H, m), 4.66 (1H, qd, J=6.52, 0.95 Hz), 1.54-1.60 (3H, m).

Workup

customAfter removal of the volatiles under vacuum
customthe residue was chromatographed (silica gel, ethyl acetate in hexanes, 0-100%)

Sources & evidence

ORD record: ord-346232b8d7fd4edc800d5db9f67dc15c
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09399649B2

Reaction notes

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