Table 1: Antiviral activities of the title compounds at 500 μg/mL.

CompoundR1R2Anti-TMV activities
Protection effectCurative effect

4am-MeOBenzyl024.2
4bm-NO2Benzyl10.40
4cm-NO2Propynyl00
4dp-NO2Benzyl00
4ep-benzyloxyBenzyl012.3
4fp-benzyloxyPropynyl15.228.9
4gp-benzyloxyAllyl22.820.7
Ribavirin32.638.5