.alpha.-Amino(1,3-dithiin-5-yl)-acetic acid in the D-, L-, or D,L-form and in which the amino radical is free or protected by tert.-butoxycarbonyl or 2,2,2-trichloroethoxycarbonyl is a useful intermediate in the preparation of cephalosporins having valuable antibacterial activity.
Dithiacycloalkenyl phosphoric esters of the following formula are effective for the control of soil and foliar insects, acarids and nematodes: ##STR1## wherein R.sub.1 is lower alkyl; R.sub.2 is lower alkoxy or lower alkylthio; R.sub.3 is hydrogen, lower alkyl or phenyl; R.sub.4, R.sub.5 and R.sub.6 are independently hydrogen or lower alkyl; Z is oxygen or sulfur; x is 0 or 1; y is 0, 1 or 2; and n is 0, 1 or 2.
Through the synthesis and study of model systems as proper dithiane derivatives, vinyl monomers and soluble copolymeric reagents containing 2-unsubstituted 1,3-dithiane rings, we attained the key synthon 1,3-dithiane-5-methanol. Through its reaction with commercial resins, new polymericreagents useful for supported organic synthesis and combinatorial chemistry were developed. Exploiting the reactivity
3-[(1,3-Dithiin-5-yl)-acetamido]-cephalosporins and antibacterial
申请人:Rhone-Poulenc Industries
公开号:US04088761A1
公开(公告)日:1978-05-09
The invention provides novel cephalosporins of the formula: ##STR1## in which R.sub.1 represents acetoxy, (5-methyl-1,3,4-thiadiazol-2-yl)-thio, (1-methyl-tetrazol-5-yl)-thio or [1-(2-hydroxyethyl)-tetrazol-5-yl]-thio and R.sub.2 represents carboxyl, or R.sub.1 represents pyridinio and R.sub.2 the carboxylato ion, and, when R.sub.2 represents carboxyl, their metal salts and addition salts with nitrogen-containing bases, which have useful antibacterial properties.