These benzidines with 3,3'-bis(sulfoalkoxy) groups have been synthesized by alkylation of commercial 3,3'-dihydroxy-4,4'-benzidine with propaneor butanesultones! However, there is no report on a synthetic method for the 2,2'-substituted or alkylsulfonated ones. We report here a route to 3,3'-bis(sulfomethy1)and 2,2'-bis (sulfoalkoxy)-4,4'-benzidine via the benzidine rearrangement.
SUBSTITUTED HETEROCYCLIC ACETAMIDES AS KAPPA OPIOID RECEPTOR (KOR) AGONISTS
申请人:Dr. Reddy's Laboratories Ltd.
公开号:US20150031685A1
公开(公告)日:2015-01-29
The present invention relates to a series of substituted compounds having the general formula (I), including their stereoisomers and/or their pharmaceutically acceptable salts, wherein R
1
, R
2
, R
3
, R
4
, R
5
, and R
6
are as defined herein. This invention also relates to methods of making these compounds including intermediates. The compounds of this invention are effective at the kappa (κ) opioid receptor (KOR) site. Therefore, the compounds of this invention are useful as pharmaceutical agents, especially in the treatment and/or prevention of a variety of central nervous system disorders (CNS), including but not limited to acute and chronic pain, and associated disorders, particularly functioning peripherally at the CNS.
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