Ester bio-isosteres: synthesis of oxadiazolyl-1-azabicyclo[2.2.1]heptanes as muscarinic agonists

J. Saunders, A. M. MacLeod, K. Merchant, G. A. Showell, R. J. Snow, L. J. Street and R. Baker, J. Chem. Soc., Chem. Commun., 1988, 1618 DOI: 10.1039/C39880001618