Dearomatizing Naphthol Mannich Bases toward Spiro Thiazolidinethiones Catalyzed by Recyclable Reduced Graphene Oxide with Air as Oxidant

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• 作者：Jingjing Li ; Meishuang Wang ; Yuqing Zhang ; Zhijin Fan ; Wenqin Zhang ; Feifei Sun ; Ning Ma
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：June 6, 2016
• 年：2016
• 卷：4
• 期：6
• 页码：3189-3195
• 全文大小：488K
• 年卷期：0
• ISSN：2168-0485

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.