2-(1-Piperazinyl) pyrimidines, their salts and pharmaceutical compositions containing them

2-(1-piperazinyl)pyrimidines of formula:

• ##STR12## in which one of radicals T and Q represents hydrogen, a hydroxyl or lower alkylcarbonyl group and the other represents hydrogen;
• and X represents:
• a group CO--R.sub.1 where R.sub.1 is a lower alkyl
• a group ##STR13## where R.sub.2 is hydrogen, or a lower alkyl, phenyl, p-hydroxyphenyl, benzyl, p-hydroxybenzyl, hydroxymethyl, 1-hydroxyethyl or 3-indolylmethyl group and R.sub.3 is hydrogen, a lower alkylcarbonyl, a benzoyl or an acyl group derived from an amino acid selected from:
• glycine, phenylglycine, alanine, valine, leucine, isoleucine, phenylalanine, tyrosine, serine, threonine or tryptophane, or an acyl group derived from a dipeptide constituted from two of the amino acids mentioned above or R.sub.2 and R.sub.3 taken together form an ethylene group;
• a group Alk--COOY, where Alk represents an alkylene group with straight or branched chain having from 1 to 4 carbon atoms and Y is hydrogen or a lower alkyl;
• a group Alk--CH.sub.2 OZ, where Alk is as defined hereinabove and Z is hydrogen, or a lower alkyl, (Lower alkoxy)-lower alkyl, lower alkylcarbonyl group;
• a group Alk--CO--W where Alk is as defined hereinabove and W is a lower alkyl group,
• as well as the pharmaceutically acceptable acid addition salts thereof.