Trimethyl borate → 2-Butyloxy-3,5-di-tert-butylphenylboronic acid

Participants

Reaction Conditions

Reaction Steps

2-Butoxy-1,5-di-tert-butyl-3-iodo-benzene (3.88 g, 10 mmol) was dissolved in anhydrous 1,2-dimethoxy-ethane (55 mL under a nitrogen atmosphere. The solution was cooled to −75° C. and t-butyl lithium (14.7 mL, 25 mmol, 1.7M in pentane) was added dropwise over 20-25 min at −72° C. to −69° C. The reaction was stirred at −72° C. for 45 min and then treated with trimethyl borate (5.7 mL, 50 mmol). The reaction was kept cold for 1 h and then the bath was removed and the reaction allowed to warm to room temperature over 24 h. It was treated with 1N hydrochloric acid (35 mL) and stirred for 30 min. The reaction was then diluted with water (200 mL) and extracted with ethyl acetate (150 mL, 2×100 mL). The combined organic portions were washed with bicarbonate solution (100 mL), water (150 mL), brine (150 mL), dried (Na2SO4), filtered and evaporated in vacuo to provide 3.0 g of an oil. The material was purified by flash chromotography (eluet: (9:1) hexane:ethyl acetate and (4:1) hexane:ethyl acetate) to provide 2.04 g (67%) of a white solid. Mp: 82-91° C. 1H NMR (250 MHz, CDCl3): δ 7.66 (d, 1H, J=2.6), 7.48 (d, 1H, J=2.6), 5.75 (s, 1H), 3.84 (t, 2H, J=7.1), 1.84 (m, 2H), 1.47 (m, 2H), 1.42 (s, 9H), 1.33 (s, 9H), 2.66 (t, 3H, J=7.3). MS [EI+] 307 (M+H)+[EI−] 305 (M−H)+.

Provenance & Evidence