Triphenylphosphine → 8-Azidomethyl-5-(4-nitrophenyl)-9H-1,3-dioxolo[4,5-h][2,3]-benzodiazepine

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A solution of 3.06 g (9.0 mmol) of 8-hydroxymethyl-5-(4-nitrophenyl)-9H-1,3-dioxolo[4,5-h][2,3]-benzodiazepine (starting compound III.) and 2.58 g (9.9 mmol) of triphenylphosphine in 100 ml of dry tetrahydrofuran is mixed with 13.5 ml of a 1.2N hydrazoic acid solution in toluene, then a solution of 1.74 ml (9.9 mmol) of azodicarboxylic acid-diethyl ester is added, and the mixture is stirred for another 2 hours. The precipitated product is suctioned off and washed with tetrahydrofuran and n-hexane. 2.23 g (68%) of the title compound with a melting point of 198-200° C. is obtained.

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