Hexane → (2,3-dihydro-1H-inden-5-yl)boronic acid

Participants

Reaction Conditions

Reaction Steps

A solution of n-butyllithium in hexane (13.2 mL of 1.6 M, 21 mmol) is added to a stirred solution of 5-bromo-indane (1.06 g, 4 mmol) in dry tetrahydrofuran (30 mL) at −75° C. under an argon atmosphere. The mixture is stirred for 30 min at −65° C., then treated with triethylborate (3.07 g, 21 mmol) and stirred for 60 min at −50° C. The resulting mixture is allowed to warm to 0° C. and then treated with a saturated aqueous solution of ammonium chloride (60 mL) and extracted with ethyl acetate (2×80 mL). The combined extracts are dried (Na2SO4), filtered and the solvent is evaporated off under reduced pressure to yield the crude product which is purified by chromatography (silica gel, 50% ethyl acetate in hexaen) and recrystallised from ethyl acetate-hexane to give indan-5-boronic acid as a colourless crystalline solid.

Provenance & Evidence