Formaldehyde → 7-Bromo-2-methyl-1,2,3,4-tetrahydroisoquinoline

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To a solution of 7-bromo-1,2,3,4-tetrahydroisoquinoline (1 g, 4.7 mmol) in formic acid (20 mL) was added formalin (1.2 mL, 15 mmol). The solution was heated to 150° C. for 5 min under microwave irradiation. The solvent was removed in vacuo and the residue was dissolved into ethyl acetate (100 mL), washed with sat. sodium bicarbonate (2×10 mL), brine (10 mL) and dried over MgSO4. Removal of the solvent gave the title compound as a white solid (800 mg, 78%). 1H NMR (400 MHz, CDCl3) δ 7.73 (d, J=8.3 Hz, 1H), 7.70 (s, 1H), 7.50 (d, J=8.0 Hz, 1H), 4.11 (s, 2H), 3.37-3.34 (m, 2H), 3.27-3.24 (m, 2H) 2.95 (s, 3H); MS ESI 225.9, 227.9 [M+H]+, calcd for [C10H12BrN+H]+ 226.0, 228.0.

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