The preparation of diastereomericallypure immunologically active carbocyclic nor-muramyldipeptide analogues (1′R,2′R)-/(1′S,2′S)-N-[2-(2′-acetylamino-cyclohexyloxy)acetyl]-L-alanyl-D-isoglutamine and (1′R,2′R)-/(1′S,2′S)-N-]2-(2′-acetylaminocyclohexyloxy)acetyl]-L-alanyl-D-glutamic acid is described. The title compounds were synthesized using two independent synthetic routes from racemic trans-2-azidocyclohexanol