Three novel routes for the preparation of the dyestuff indigo are described. Two of the methods use isatoic anhydride, the third one styrene as starting materials. Key reactions are acylation of both dimsyl and nitromethane anions, Pummerer rearrangement and Nef reaction. A novel nitration of styrene is the basis of the third method.
3-(Methylsulfinyl)cinnolinones and their derivatives
申请人:Warner-Lambert Company
公开号:US03937704A1
公开(公告)日:1976-02-10
3-substituted cinnolinones having the following structural formula are disclosed: ##SPC1## Wherein R.sub.1 is hydrogen, lower alkyl, aralkyl or acyl and R.sub.2 and R.sub.3 are hydrogen, halogen, lower alkoxy or lower alkyl, and X is ##EQU1## CH.sub.3 COOCH.sub.2 S-, or ##SPC2## These compounds are useful as immunosuppressants.
5H-[1,2]benzisothiazolo[2,3-a]quinoline-5-ones and analogs as
申请人:The Du Pont Merck Pharmaceutical Company
公开号:US05393756A1
公开(公告)日:1995-02-28
The present invention relates to 5H-[1,2]benzisothiazolo[2,3-a]quinoline-5-ones, pharmaceutical compositions thereof and to methods of using these compounds for the treatment of inflammatory disorders.