An improved synthesis of (1R,3S)-3-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid

An improved synthesis of (1R,3S)-3-[(tert-butoxycarbonyl)amino]cyclohexanecarboxylic acid from 3-aminobenzoic acid is described utilising milder and more selective conditions. Both a classical salt resolution and an enzymatic approach have been shown to give the desired compound in high selectivity.