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The synthesis of some alpha-hydrazinoarylacetic acids (I) by reaction of alpha-bromoarylacetic acids with hydrazine, alkylhydrazines and carbobenzyloxyhydrazines is described. Reduction of the hydrazones of 2- and 3-thienylglyoxylic acids provided a general and effective route to the thienylic series. In view of the use of compounds (I) for the preparation of new penicillins, the experimental conditions for their conversion into cyclohexylamides (XI) via the corresponding carbobenzyloxyderivatives (III) were also investigated.
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