Abstract: A method for treating a viral infection in a human or animal patient comprising administering to such patient an antivirally effective amount of a substituted hydroxypiperidine, namely a 2-hydroxymethylene-3,4,5-trihydroxypiperidine.

Abstract: N-substituted derivatives of 1-desoxynojirimycin and 1-desoxymannojirimycin of the formula ##STR1## in which one of R and R' are hydroxyl and the other is hydrogenn is a number from 1 to 6R.sup.1 is hydrogen, alkyl or benzyl andR.sup.2 is alkyl which is optionally substituted by an optionally substituted aryl or by pyridyl, thienyl, furyl, pyrimidyl, pyrazinyl or quinolyl or R.sub.1 is cycloalkyl or R.sup.2 is optionally substituted by aryl or R.sup.2 is a saturated bridged heterocycle or R.sup.1 and R.sup.2 together can form a heterocyclic ring which is optionally substituted. These compounds are useful in the treatment of and prophylaxis of viral infections.

Abstract: A 3-amino-4,5-dihydroxy-piperidine compound of the formula (I) ##STR1## in which R.sup.1 represents hydrogen, alkyl having up to 8 carbon atoms, aralkyl having 7 to 14 carbon atoms, or represents a group of the formula ##STR2## R.sup.4 denotes straight-chain or branched alkyl having up to 8 carbon atoms, straight-chain or branched alkoxy having up to 8 carbon atoms, or aralkoxy having up to 10 carbon atoms, andR.sup.2 and R.sup.3 represent hydrogen or represent the group NHR.sup.5,R.sup.5 having the same meaning as R.sup.1 and being identical to or different from the latter,with the proviso that, in every case, one substituent of R.sup.2 or R.sup.3 represents hydrogen and the other substituent of R.sup.2 or R.sup.3 represents NHR.sup.5, and physiologically acceptable salts thereof. Such compound is useful to treat prediabetes, gastritis, constipation, caries, atherosclerosis, obesity, diabetes and hyperlipoproteinaemia.