Stereoselectivity of some oxotremorine antagonists containing two chiral centres.

The stereoisomers of some analogues of oxotremorine containing two chiral centres, one in the 1-position of the butynyl chas are oxotremorine antagonists. They show a marked stereoselectivity, which depends mainly on the configuration of the chiral centre in the butynyl chain and to a lesser extent on the configuration of that in the pyrrolidine ring.