Synthesis and properties of oxytocin analogues acting as irreversible inhibitors of the uterotonic response to oxytocin

A series of compounds containing reactive groups of different chemical character was synthetized from [4-glutamic acid]deamino-1-carba-oxytocin or from [2-O-methyltyrosine, 4-glutamic acid]deamino-1-carba-oxytocin. The analogues acted as specific irreversible inhibitors of the uterotonic response to oxytocin. Active esters of the initial compounds were the most effective inhibitors.