Tributylvinyltin → 1-Chloro-3-methyl-2-vinylnaphthalene

Temperature

50 °C

To a solution of trifluoro-methanesulfonic acid 1-chloro-3-methyl-naphthalen-2-yl ester (14.75 g, 45.43 mmol), tributyl(vinyl)tin (14.59 mL, 49.97 mmol) and lithium chloride (5.78 g, 136.29 mmol) was added dichlorobis(triphenylphosphine) palladium(II) under argon. The reaction mixture was heated at 50° C. for 20 h, then heated at 90° C. for 8 h. The reaction mixture was than cooled to room temperature, diluted with ethyl acetate, washed with 5% lithium chloride solution (3×), brine and dried (MgSO4), filtered and then concentrated and purified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes) to give 1-chloro-3-methyl-2-vinyl-naphthalene contaminated by organotin. The residue was dissolved in dichloromethane and stirred with 10% KF solution overnight. The resulting white mixture was filtered through a pad of Celite and extracted with dichloromethane (2×). The organic layer was concentrated and purified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes) to give 1-chloro-3-methyl-2-vinyl-naphthalene. 1H NMR (400 MHz, CDCl3) δ 8.28 (d, J=8.2 Hz, 1H), 7.73 (d, J=8.2 Hz, 1H), 7.59 (s, 1H), 7.59-7.48 (m, 2H), 6.90 (dd, J=18.0, 11.8 Hz, 1H), 5.73 (d, J=11.8 Hz, 1H), 5.53 (d, J=18.0 Hz, 1H), 2.50 (s, 3H).

1. temperatureheated at 90° C. for 8 h
2. temperaturethan cooled to room temperature
3. washwashed with 5% lithium chloride solution (3×), brine
4. dry with materialdried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by flash column chromatography (silica gel, 0 to 10% ethyl acetate/hexanes)

ORD record

ord-cf12fc7557a44adfab7fe647894400f0

Source dataset

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09284323B2