The object of the present invention is benzothiazine derivatives having the capability of inhibiting 11&bgr；-HSD1 not only at an enzymatic level but also at a cell level. The compounds of the present invention are of general formula (I). Wherein notably R1 represents a hydrogen or OR1 represents an ester or an ether. R2 represents a naphthyl or a 1,2,3,4-tetrahydro-naphthalene or a biphenyl or phenyl pyridine or a substituted phenyl. R3 represents a methyl or ethyl； R4 and R&prime；4 represent a hydrogen.
