N-Fluorobenzenesulfonimide → (5-Fluoro-2-triisopropylsilanyl-2,7,8,9-tetrahydro-6-oxa-2-azabenzo[cd]azulen-8-yl)dimethyl-amine

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A solution of compound (42) 451 mg in dry tetrahydrofuran 5 ml was cooled at −70° C. n-BuLi (1.56 mol/l hexane solution) 1.3 ml was added dropwise to the mixture, which was stirred for 1 h. Then, N-fluorobenzenesulfonimide 694 mg was added and the mixture was stirred for 3.5 h. The reaction mixtures was diluted with an aqueous ammonium chloride solution, extracted with ethyl acetate. The extracts were washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue obtained was chromatographed on aluminum oxide in ethyl acetate:hexane (1:5) to give a yellow oil. This was chromatographed on thin aluminum oxide plates (Merck precoated TLC plate alumina 60F254 in ethyl acetate:hexane (1:5)) to give the titled compound as a pale yellow oil, 100 mg.

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