Hydrochloric Acid → 2-Benzyloxy-5-trifluoromethylphenylboronic acid

Participants

Reaction Conditions

Reaction Steps

A solution of 4-benzyloxy-3-iodobenzotrifluoride (15.07 g, 39.85 mmol) in tetrahydrofuran (200 ml) was cooled to −40° C. with stirring under nitrogen. 2M isopropylmagnesium chloride in diethyl ether (39.85 ml, 79.7 mmol) was added dropwise and the mixture stirred at −40° C. for 40 minutes, then cooled to −75° C. Trimethyl borate (8.3 g, 9.2 ml, 79.7 mmol) was added at −75° C. over 10 minutes and the reaction stirred and allowed to reach 0° C. over 1 h. 1M hydrochloric acid (200 ml) was added and the mixture stirred vigorously for 1 h.

Provenance & Evidence