Tetrahydrofuran → HCID 67795572, compound

Temperature

0 °C

To a solution of 3-bromo-5-methylene-dibenzo[a,d]cycloheptene (3.8 g) in dry tetrahydrofuran (20 ml). under an inert atmosphere. was added 9-borabicyclo [3.3,1 ]nonane (30 ml of a 0.5 molar solution in tetrahydrofuran) at ambient temperature and the reaction mixture was refluxed for 3 h. After cooling in an ice bath the reaction was quenched by the slow addition of 2N sodium hydroxide solution (100 ml) and 30% hydrogen peroxide (20 ml). After stirring vigorously at 0° C. for 45 minutes the reaction mixture was allowed to warm to room temperature over a 2 hour period then extracted with diethyl ether (3×200 ml). The combined organic layers were washed with brine (1×100 ml), dried (Na2SO4) filtered and concentrated in vacuo to leave a residue which was purified by chromatography on flash silica with 30% ethyl acetate in hexane as eluent to give the title compound (2.3 g) as a colourless oil. δ (CDCl3, 360 MHz) 3.83 (2H, d, J=7.9 Hz, CH2OH), 4.13 (1H, t, J=7.9 Hz, CH--CH2OH), 6.78 (1H, d, J=12 Hz, CHA =CHB), 6.87 (1H, d, J=12 Hz, CHA =CHB), 7.17-7.50 (7H, m, ArH). m/e 302 and 300 (M+).

1. temperaturethe reaction mixture was refluxed for 3 h
2. temperatureAfter cooling in an ice bath the reaction
3. customwas quenched by the slow addition of 2N sodium hydroxide solution (100 ml) and 30% hydrogen peroxide (20 ml)
4. temperatureto warm to room temperature over a 2 hour period
5. extractionthen extracted with diethyl ether (3×200 ml)
6. washThe combined organic layers were washed with brine (1×100 ml)
7. dry with materialdried (Na2SO4)
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customto leave a residue which
11. customwas purified by chromatography on flash silica with 30% ethyl acetate in hexane as eluent

ORD record

ord-3de40a0d8eca4ecf89ef8a1fdbb8b922

Source dataset

uspto-grants-1990_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04927819