The discovery of potent, orally bioavailable pyrazolo and triazolopyrimidine CXCR2 receptor antagonists
摘要:
A hit-to-lead optimisation programme was carried out on the Novartis archive screening hit, pyrazolopyrimidine 2-methyl-5-((phenylthio)methyl)pyrazolo[1,5-a]pyrimidin-7-ol 1, resulting in the discovery of CXCR2 receptor antagonist 2-benzyl-5-(((2,3-difluorophenyl)thio)methyl)-[1,2,4]triazolo[1,5-a]pyrimidin-7-ol 14. The SAR was investigated by systematic variation of the pendant thiol, alkyl and pyrimidinol groups. Replacement of the pyrazolopyrimidine core with a triazolo alternative led to a dual series of antagonists with favourable biological and pharmacokinetic properties. (C) 2013 Elsevier Ltd. All rights reserved.
The present invention relates to novel trifluorobutenyl imidazole thioether derivatives of the following formula (1) wherein R
1
represents hydrogen or halogen, R
2
represents hydrogen, halogen or alkoxycarbonyl, R
3
represents hydrogen, alkyl, alkenyl, cycloalkyl or aralkyl, and n represents 0,1 or 2, with the proviso that R
1
, R
2
and R
3
do not all represent hydrogen at the same time to a process for their preparation and to their use as nematicides.
A process for producing a polythiourethane resin which comprises (A) a step of synthesizing a polythiol oligomer having disulfide bond by reaction of a polythiol compound having a functionality of two or greater and sulfur and (B) a step of bringing the polythiol oligomer obtained in step (A) and a compound having poly(thio)isocyanate groups into reaction with each other, wherein step (A) is conducted in the absence of solvents using no catalysts or a catalyst substantially inert to the compound having poly(thio)isocyanate groups. A polythiol oligomer exhibiting a greater refractive index than that of the polythiol compound having a functionality of two or greater used as the starting material is produced at a low cost, and a process for producing a practically useful polythiourethane resin exhibiting a stable great refractive index and a great Abbe number is provided.