In vivo activity of an azole series of CCR2 antagonists
作者:Chris A. Smethurst、Nicola Bevan、Carl Brooks、Amanda Emmons、Peter J. Gough、Claudette Mookherjee、Kitty Moores、Simon Peace、Joanne Philp、Val Piercy、Steve P. Watson、Mara Zippoli
DOI:10.1016/j.bmcl.2012.09.020
日期:2012.12
Optimisation of a series of biaryl sulphonamides resulted in the identification of compound 7 which demonstrated dose-dependent and strain-specific inhibition of monocyte recruitment in a thioglycollate-induced peritonitis model of inflammation.
Two separate series of the title systems have been prepared by cyclisation of tetrazolium salts having acylmethyl functions attached to both the ring carbon and the adjacent nitrogen atom (3, 4): (i) working in an acetate buffer led to 7-acyl derivatives (5, 6; Scheme 3), and (ii) treatment with anhydride–base gave 5,7-diacyl compounds by a deviating ring closure mechanism (11, 12; Scheme 4). These materials could be defunctionalised to afford pyrrolotetrazoles (7, 8) which were earlier approached in vain from the respective 5-methyltetrazolium salts (Tschitschibabin reaction). Regarding characterisation data, attention is drawn to the conspicuous spectroscopic differences between the 1H- and the 2H-system. 2H-Pyrrolotetrazoles (6, 8, 12) represent a novel class of Ramsden’s ‘type C’ heteropentalene mesoions.