Hydrogen Bromide → 2-Bromo-10,11-dihydro-dibenz[b,f]oxepin-10-one

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Reaction Steps

In an analogous manner to that described in Example 6, 30 g. of 2-amino-10,11-dihydro-dibenz[b,f]oxepin-10-one are diazotized with 12 g. of sodium nitrite in methanesulfonic acid solution. The solution obtained is poured into a mixture of 540 ml. of ethyl acetate and a solution of 57.2 g. of copper (I) bromide in 666 ml. of 48% hydrobromic acid. After 10 minutes, the mixture is worked-up in the same manner as described in Example 6, and there is obtained 2-bromo-10,11-dihydro-dibenz[b,f]oxepin-10-one having a melting point of 53°-54° C. The product is reacted further in an analogous manner to that described in Example 1 to give the desired starting material, 1-[2-bromo-10,11-dihydro-dibenz[b,f]oxepin-10-yl]-piperazine having a melting point of 93°-94° C. The following intermediates are obtained:

Provenance & Evidence