Process for the preparation of donor-substituted N-formylaminoaromatics and donor-substituted formanilides

摘要

A one-step process for the preparation of donor-substituted aromatic N-formylamino compounds from donor-substituted aromatic nitro compounds and formic acid in the presence of a palladium catalyst at temperatures of approximately 0 DEG C to approximately 200 DEG C is characterised in that no further reducing agents are added. Donor-substituted aromatic N-formylamino compounds are obtained in high purity and good yield by the process according to the invention. The process makes possible a simple work-up in terms of apparatus at atmospheric pressure with simultaneous use of cost-effective materials. Using the process according to the invention, novel formanilides of the formula III are also prepared IMAGE wherein: X is NH2, NHR3, NR3R4, NHCOR3, N-morpholino, N-piperidyl, N-piperazyl, N-pyrrolidyl, N-imidazolidyl, N-pyrazolidyl and N-indolinyl, R1, R2, R3 and R4 are identical or different and are a branched or unbranched alkyl group having 1 to 12 C atoms. These compounds can be used as intermediates for the preparation of diazotype precursors.