Provided herein are compounds of the formula (I):
as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of inflammatory diseases and disorders such as, for example, asthma and COPD.
A New Approach to the Synthesis of N-Protected 2- and 5-Substituted 3-Halopyrroles
作者:Thierry Masquelin、Daniel Obrecht
DOI:10.1055/s-1995-3893
日期:1995.3
A new and efficient method for the preparation of N-protected 5- and 2-substituted 3-bromopyrroles 15 and 16 via acid-catalyzed cyclization of the corresponding acetylenic ketones 6 and acetylenic acetals 14 has been found (Scheme 3). Using this methodology, rapid and quite general access to highly substituted pyrroles, which are known to exhibit a number of interesting biological activities, has been established.