申请人:Alvarez Builla Gomez Julio
公开号:US20070249678A1
公开(公告)日:2007-10-25
Novel pyroglutamic acid derivatives (I), wherein R
1
is −OH, −ORa, wherein Ra is alkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl, aralkyl or heterocyclyl; R
2
, R
3
and R
4
are independently H, a nitrogen protecting group which hydrolyzes under acidic conditions or phtalamide; X is a pharmaceutically acceptable anion; and Y is a N-containing group; either in the form of their isolated optically active stereoisomers or in the form of mixtures thereof, are useful compounds for enhancing an immuneresponse in a subject and/or for treating tumours, bacterial, fungal or viral infections, or autoimmune diseases.