A Mild, Nonacidic Method for the Conversion of Carboxylic Esters into Oxazolines
作者:J. H. Dodd、J. Guan、C. F. Schwender
DOI:10.1080/00397919308013297
日期:1993.4
Abstract Conversion of carboxylic esters directly into amide alcohols is facilitated by use of base. Combined with a nonacidic cyclization of the intermediate amide alcohol this method allows formation of oxazolines under nonacidic conditions directly from the carboxylic esters.
There is provided, a novel class of compounds exhibiting antibacterial activity and having the formula: ##STR1## wherein X and Y each represent a member which may be the same or different selected from the group consisting of H and Cl with the proviso that X and Y cannot represent H simultaneously; R.sub.1 and R.sub.2 each represent a member which may be the same or different selected from the group consisting of an n- or branched alkyl group of from 1 to 20 carbon atoms, an aryl group (phenyl, naphthyl, etc.) and a ##STR2## WHEREIN M REPRESENTS AN INTEGER OF FROM 2 TO 5; N REPRESENTS AN INTEGER OF 1 TO 8; AND Z represents a member selected from the group consisting of an --OOCR.sub.3 group, an --OR.sub.3 group and an --OCH.sub.2 OR.sub.3 group, wherein R.sub.3 represents a member selected from the group consisting of an n- or branched alkyl group of 1 to 20 carbon atoms, a phenyl group, a naphthyl group, a benzyl group, ##STR3## WHEREIN X is a halogen atom (Cl, Br, I), ##STR4## WHEREIN R.sub.4 represents a member selected from the group consisting of H, an n- or branched alkyl group, a benzyl group, and a --(CH.sub.2).sub.p COOH group, wherein p represents an integer of 1 to 4, and wherein W.sup..theta. represents a non-toxic pharmaceutically acceptable inorganic or organic anion.
There is provided, a novel class of compounds exhibiting antibacterial activity and having the formula: ##STR1## wherein X and Y each represent a member which may be the same or different selected from the group consisting of H and Cl with the proviso that X and Y cannot represent H simultaneously; R.sub.1 and R.sub.2 each represent a member which may be the same or different selected from the group consisting of an n- or branched alkyl group of from 1 to 20 carbon atoms, an aryl group (phenyl, naphthyl, etc.) and ##STR2## WHEREIN M REPRESENTS AN INTEGER OF FROM 2 TO 5; N REPRESENTS AN INTEGER OF 1 TO 8; AND Z represents a member selected from the group consisting of an --OOCR.sub.3 group, an --OR.sub.3 group and an --OCH.sub.2 OR.sub.3 group, wherein R.sub.3 represents a member selected from the group consisting of an n- or branched alkyl group of 1 to 20 carbon atoms, a phenyl group, a naphthyl group, a benzyl group, ##STR3## WHEREIN X is a halogen atom (Cl, Br, I), ##STR4## WHEREIN R.sub.4 represents a member selected from the group consisting of H, an n- or branched alkyl group, a benzyl group, and a --(CH.sub.2).sub.p COOH group, wherein p represents an integer of 1 to 4, and wherein W.sup..crclbar. represents a non-toxic pharmaceutically acceptable inorganic or organic anion.
The present invention is concerned with isoxazole-pyridine derivatives of formula I
wherein X, R
1
to R
6
are as described herein. The compounds are active on the GABA A α5 receptor binding site and useful for the treatment of cognitive disorders, such as Alzheimer's disease.
本发明涉及式I的异噁唑-吡啶衍生物,其中X,R1至R6如此处所述。该化合物在GABA A α5受体结合位点上具有活性,并且可用于治疗认知障碍,如阿尔茨海默病。
Dodd John H., Guan Jihua, Schwender Charles F., Synth. Commun., 23 (1993) N 7, S 1003-1008