Heat developable light-sensitive material

A heat developable light-sensitive material comprising a support having thereon at least one light-sensitive silver halide emulsion layer comprising light-sensitive silver halide and a binder, and at least one layer on said support comprises as a base precursor a compound represented by the following general formula (I):

• ##STR32## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a carboxy group or a salt thereof;
• R.sub.3 and R.sub.4, which may be the same or different, each represents a hydrogen atom, a halogen atom a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted amino group, a substituted or unsubstituted acylamino group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, a substituted or unsubstituted acyloxy group, a phosphoryl group substituted with a substituted or unsubstituted alkyl group or aryl group, a phosphinyl group substituted with a substituted or unsubstituted alkyl group or aryl group, a thio group substituted with a substituted or unsubstituted alkyl group or aryl group, a sulfinyl group substituted with a substituted or unsubstituted alkyl group or aryl group or a sulfonylamino group substituted with a substituted or unsubstituted alkyl group or aryl group, a cyano group, a hydroxy group, a carboxy group or a salt thereof;
• X.sub.0 represents a group capable of accelerating decarboxylation selected from the group consisting of an alkoxy group, an aryloxy group, an acylamino group, a sulfonylamino group, an imido group, an acyloxy group, an alkylthio group, an arylthio group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, a dialkylcarbamoyloxy group and a nitrogen-containing heterocyclic group;
• B.sub.0 represents an organic base;
• and n.sub.0 represents 1 when B.sub.0 represents a monoacidic base or 2 when B.sub.0 represents a diacidic base, said light-sensitive material containing a reducing agent.