Pyridine → 7-Chloro-3-fluoro-5-phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one

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Reaction Steps

First, 1.2 of KF and then 2.9 g. of 3-hydroxy-5-phenyl-7-chloro-2,3-dihydro-1H-1,4-benzodiazepin-2-one are added to a mixture of 35 g. of HF and 15 ml. of pyridine and the mixture is stirred for 1 hour more. Working up in the customary manner using sodium carbonate solution/ethyl acetate gives 3-fluoro-5-phenyl-7-chloro-2,3-dihydro-1H-1,4-benzodiazepin-2-one, m.p. 235° (decomposition).

Provenance & Evidence