The Methology Study Of Organic Synthesis Starting From Cx₂（O,S） As Materials

Because of the rapid deterioration of ecological environment and the serious shortness of resources, effective utilization of resources and energy, environmental protection, development of green chemistry to become the trend of the times. Carbon dioxide as a cheap, safe and plentiful renewable resources can be converted to high value-added chemicals by chemical conversion. Therefore, from the view point of sustainable development and green chemistry, the design of carbon dioxide as a reactant, utilization of carbon dioxide by chemical conversion, gradually become one of research frontiers and focuses in the field of green chemistry. Oxygen and sulphur belong to the VIA group, the structure of carbon disulfide is similar to carbon dioxide, it is a kind of cheap resources, also has received the attention.This paper, using carbon dioxide and carbon disulfide as reactants convert to valuable chemicals catalyzed by chemical catalyst and a series of organic compounds are synthesized. The main contents of this paper are as follows:1. The paper reviewed the present status of the utilization of carbon dioxide. Emphasis on carbon dioxide for preparation of synthetic organic compounds.2. A novel method of preparing quinazoline derivatives by capturing CX2(O, S) in reusable, room-temperature, reversible ionic liquids(ReILs) with high yields(up to 98%) at 40 °C and atmospheric pressure was developed in this paper. The different reaction conditions were optimized and the products were easily separated from the ReILs which could be reused at least six times without considerable loss in yield. The plausible mechanism of capturing CX2(O, S) in the ReILs was proposed and it provides a green, efficient protocol to capture CX2(O, S) in ReILs to synthesize quinazoline derivatives. Fourteen compounds were synthesized, their structures were charaterized by 1H NMR, 13 C NMR, IR, HRMS.3. In this paper presents a simple and effective method of capturing CO2 via the o-phenylenediamines carbonylation catalyzed by DBU/S at atmospheric pressure to synthesize 2-benzimidazolones. Different reaction conditions were optimized and a series of benzimidazolones were obtained with excellent yields; A series of benzimidazolthiones were synthesized catalyzed by [DBUH][OAc] in the mild conditions. Twenty-six compounds were synthesized, their structures were charaterized by 1H NMR, 13 C NMR.4. A novel green method to synthesize diaryl thioethers from aryl halides and carbon disulfide catalyzed by 1,8-diazabicyclo-[5.4.0]undec-7-ene(DBU)-based ionic liquids(ILs) under solvent-free conditions has been developed. This metal-free catalytic system displayed high efficiency for coupling aryl halides by CS2 to deliver thioethers. Twelve compounds were synthesized, their structures were charaterized by 1H NMR, 13 C NMR.In summary, this paper provides the new green methods of synthesis of organic compounds by using carbon dioxide or as a resource.