Isoamyl Nitrite → (6E)-2-bromo-6-hydroxyimino-8,9-dihydro-7H-benzo[7]annulen-5-one

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J.3, 2-Bromo-6,7,8,9-tetrahydro-5H-benzo[7]annulen-5-one (1.5 g, 5.9 mmol) was dissolved in 2:1 ether/tetrahydrofuran (120 mL) and 1N HCl in ether (9 mL) was added. The solution was cooled to 0° C. before addition of isoamyl nitrite (1.2 mL, 9 mmol) and the reaction was stirred 18 h at 24° C., concentrated, and applied to 25 (M) Biotage silica gel column. Gradient elution from 15-100% B (A=Hexanes; B=ethyl acetate) over 1 L and gave J.3a (E)-2-bromo-6-(hydroxyimino)-6,7,8,9-tetrahydro-5H-benzo[7]annulen-5-one 1 g (64%). LC (Cond.-J1); RT=1.9 min; LC/MS: Anal. Calcd. for [M+H]+ C11H10NBrO2: 268; found: 268.

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