Triethylamine → 6-ethenyl-3-methyl-3,4-dihydro-1H-isochromen-1-one

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A solution of (3R)-6-bromo-3-methyl-3,4-dihydro-1H-isochromen-1-one (2.4 g, 9.96 mmol) and triethylamine (2.78 ml, 19.91 mmol) in EtOH (39.8 ml) was added to a microwave vial containing Cl2Pd(dppf)2-DCM (0.406 g, 0.498 mmol) and potassium vinyltrifluoroborate (2,000 g, 14.93 mmol). The contents of the vial were heated to 100° C. for 1 hour after which the mixture was cooled, diluted with chloroform (50 mL) and washed with aqueous ammonium chloride (25 mL). The organic layer was then dried over magnesium sulfate, filtered and the solvent was evaporated under reduced pressure. MPLC purification (15-60% EtOAc/Hex) gave 6-ethenyl-3-methyl-3,4-dihydro-1H-isochromen-1-one. 1H NMR (500 MHz; CDCl3): 8.07 (d, J=8.0 Hz, 1H), 7.44 (dd, J=1.2, 7.1 Hz, 1H), 7.26 (s, 1H), 6.75 (dd, J=10.8, 17.6 Hz, 1H), 5.90 (d, J=17.6 Hz, 1H), 5.44 (d, J=11 Hz, 1H), 4.75 (m, 1H), 2.96 (m, 2H), 1.54 (d, J=6.1 Hz, 3H); LC/MS (M+H)+189;

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