文摘
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 X-ray 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, Botrytis cinerea, Thanatephorus cucumeris, and other fungi.
