Novel potent substance P and neurokinin A receptor antagonists. Conception, synthesis and biological evaluation of indolizine derivatives.

Exploration of SAR around dual NK(1)/NK(2) antagonist Cbz-Gly-Leu-Trp-OBzl(CF(3))(2) and its derivatives disclosed the essential requirements for more potent dual NK(1)/NK(2) binding. We report here the synthesis and the biological properties of a novel series of indolizine including pharmacophoric elements.