Ruthenium/TFA-catalyzed regioselective C-3-alkylation of indoles with terminal alkynes in water: efficient and unprecedented access to 3-(1-methylalkyl)-1H-indoles
The invention relates to cyclic peptide derivatives, to their use in medicine, to compositions containing them, to processes for their preparation and to intermediates used in such processes. More particularly the invention relates to cyclic peptide C5a receptor antagonists of formula (Ia) or formula (Ib), or pharmaceutically acceptable salts thereof, wherein R
1a
, R
1b
, R
2
, R
3
and R
4
areas defined in the description. C5a receptor antagonists are potentially useful in the treatment of a wide range of 1 disorders, including inflammatory disorders and immune disorders.