Heterobicyclic keto- and amino-acids, esters and amides
申请人:Pfizer Inc.
公开号:US04341792A1
公开(公告)日:1982-07-27
Heterobicyclic glyoxylic acids, L- and DL-heterobicyclic glycines and their derivatives of the formulae ##STR1## and pharmaceutically acceptable cationic and acid addition salts thereof, wherein R is OR.sup.2 or NHR.sup.3 ; R.sup.2 is hydrogen or alkyl having from one to four carbon atoms; R.sup.3 is hydrogen, alkyl having from one to four carbon atoms, alkoxyalkyl having from one to four carbon atoms in each of the alkyl groups or R.sup.4 R.sup.5 C.sub.6 H.sub.3 CH.sub.2 -- where R.sup.4 and R.sup.5 are H, OH, F, Cl, Br, I, or alkyl or alkoxy having from one to four carbon atoms R.sup.1 is hydrogen, alkyl having from one to four carbon atoms or R.sup.4 R.sup.5 C.sub.6 H.sub.3 --; X is oxygen or sulfur; n is 0 or 1 and the broken line represents an optionally present double bond; useful in treatment of diseases and conditions which are characterized by reduced blood flow, reduced oxygen availability or reduced carbohydrate metabolism in the cardiovascular system.
through a sequence involving thiocarbonylation followed by reduction (Scheme 5). Thereafter, the double intramolecular cyclization of the resulting diamino diester 22c proceeded easily to afford 2′b. This intermediate may be transformed via the tetrol 2′g or the diol 2′h into the N-protected derivatives of 2 (X = OR) and of 3 (X = OCOR). Cleavage of the 4-alkuxybenzyl groups was achieved by ceric ammonium
Process for manufacturing N-acyl derivatives of hydroxy-arylglycines
申请人:Nobel Hoechst Chimie
公开号:US04105690A1
公开(公告)日:1978-08-08
Condensation of the addition product of glyoxylic acid and amides with hydroxyaryl compounds is effected by a first step, wherein the reaction is carried out hot, at a temperature below 60.degree. C, of an aliphatic amide having at the most 4 carbon atoms selected from the group of acetamide, chloracetamide, propionamide, acrylamide and butyramide, on an aqueous solution of glyoxylic acid. Then in a second step, after the addition of acetic acid and gaseous hydrochloric acid, condensation is effected at a temperature below 35.degree. C of the carboxamidoglycolic acid with an excess reaching 500% of hydroxyaryl compound selected from the group comprising phenol and its alkyl derivatives, their halogen derivatives, polyphenols and their ethers and betanaphthol. After the condensation of said second step, the volatile products are removed by vacuum distillation. When the hydroxyaryl compound is phenol, the crude product resulting from this distillation is taken up in nitromethane or water, which are a non-solvent of the N-acyl derivative of parahydroxyphenylglycine but a solvent of the corresponding ortho derivative; the proportion of the para derivative in the resulting compound is then of the order of 100%.