N-bromobutanimide → Tert-butyl 1-bromo-6-cyano-2-naphthylcarbamate

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A solution of 140 (4.48 g, 18 mmol) and NBS (3.85 g, 21.6 mmol) in MeCN (80 mL) was stirred at reflux for 1 h, then concentrated under reduced pressure. The residue was dissolved in CH2Cl2, washed with 10% aqueous Na2SO3, water, dried, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel, eluting with CH2Cl2, to give tert-butyl 1-bromo-6-cyano-2-naphthylcarbamate (141) (5.69 g, 91%): mp (iPr2O/hexane) 164-166° C.; 1H NMR [(CD3)2SO] δ 9.01 (s, 1H), 8.63 (d, J=1.5 Hz, 1H), 8.27 (d, J=9.0 Hz, 1H), 8.07 (d, J=9.0 Hz, 1H), 7.94 (d, J=8.9 Hz, 1H), 7.93 (dd, J=8.9, 1.8 Hz, 1H), 1.50 (s, 9H). Anal. (C16H15BrN2O2) C, H, N, Br.

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