Trifluoroacetic acid → 7-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-1,4-benzoxazepine trifluoroacetate salt

Beteiligte Stoffe

Reaktionsschritte

A solution of 1,1-dimethylethyl 7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (3.0 g, 8.00 mmol) in dichloromethane (90 mL) and trifluoroacetic acid (10 mL) was heated to reflux for 1 h, and then cooled to room temperature. The reaction mixture was concentrated and the residue was azeotroped with toluene (100 mL) to give 7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-1,4-benzoxazepine trifluoroacetate salt (2.9 g, quantitative yield). MS (EI) for C15H22BNO3: 276 (MH+).

Herkunft & Nachweise