Synthesis and biological activity of substance P analogues

Abstract
The synthesis of the hexapeptide [Glu6]SP6-11 and its glycosylated analogue at the Glu6γ-carboxyl position by solution procedures according to several strategies is discussed. The biological activity of SP, [GIu6]SP6-11 (VI) and [Glu(β-d-Glcp)6]SP6-11 (VIII) have been determined and compared to SP by the GPI and RVD assays. The introduction of a β-d-glucopyranosyl moiety at the sixth position of the [Glu6]SP6-11 did not affect to a great extent the in vitro activity pattern of the parent hexapeptide.