▎ 摘　　要

Reduced graphene oxide (rGO) served as a green catalyst with ambient oxygen as a clean oxidant for dearomatizing cyclizations of naphthol Mannich bases with carbon disulfide under mild conditions. Notably, this process provides novel and efficient one-pot access to Spiro thiazolidinethione compounds. Fourier transform infrared analysis, transmission electron microscopy, atomic force microscopy, X-ray photoelectron microscopy, thermogravimetric analysis, Raman analysis, and Xray diffraction were used to characterize rGO. And, the rGO can be reused at least six times without significant loss of catalytic activity. A possible reaction mechanism was proposed. In addition, some target compounds showed inhibition against Sclerotinia sclerotiorum, fungi. Botrytis cinerea, Thanatephorus cucumeris, and other fungi.