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without obvious loss of activity. Table 2. One-pot three-component reactions of propargylic alcohols, CO2 and 2-aminoethanols. Catalyst (Catalytic Amount/mol%) Solvent CHCl3 CH3CN T/°C P/MPa t/h Yield (2-oxazolidinones)/% a,b Ref. 12 of 41 Molecules 2019, 24, 182 Ag2CO3 (5), Xantphos (10) 60 1 18-48 80 1 12 33–92 [69] 24–99 [70] Ag2O (5), TMG (30) 2-oxazolidinone and an α-hydroxyketone with a subsequent intramolecular cyclization (Scheme 10b). CuI (5), 1,10-phen (5), t-BuOK Notably, copper complex Cu2I2(phen)2 in situ formed from CuI and 1,10-phen could activate the C≡C - 80 0.5 12 24–97 [66] through coord(i1n0)ation. Most recently, 1,5,7-triazabicylo[4.4.0]dec-5-ene ([TBDH][TFE]) trifluoroethanol was used to catalyze the synthesis of oxazolidinones from propargylic alcohols, 2-aminoethanols and [TBDH][TFE] (15) - 80 0.1 12 24–99 [71] CO2 under atmospheric pressure [71]. The catalysts could be recovered and reused at least five times without obvious loss of activity. Scheme 10. Synthesis of 2-oxazolidinones through thermodynamically favourable approach [68]. Scheme 10. Synthesis of 2-oxazolidinones through thermodynamically favourable approach [68]. Table 2. One-pot three-component reactions of propargylic alcohols, CO2 and 2-aminoethanols. 2.3. Quinazoline-2,4(1H,3H)-Diones through Carbonylation of 2-aminobenzonitrile and CO2 a NMR yield.; b Isolated yield. Catalyst (Catalytic Amount/mol%) Solvent T/◦C P/MPa t/h Yield Ref. (2-oxazolidinones)/% a,b Quinazoline-2,4(1H,3H)-diones have wide applications in the synthesis of pharmaceuticals, Ag2CO3 (5), Xantphos (10) CHCl3 60 1 18–48 33–92 [69] such as Zenarestat, Prazosin, Doxazosin, and Bunazosin [72]. The synthesis of Ag2O (5), TMG (30) CH3CN 80 1 12 24–99 [70] CuI (5), 1,10-phen (5), t-BuOK (10) - 80 0.5 12 24–97 [66] quinazoline-2,4(1H,3H)-dione derivatives through carbonylation of 2-aminobenzonitrile and CO2 is [TBDH][TFE] (15) - 80 0.1 12 24–99 [71] a NMR yield.; b Isolated yield. 2.3. Quinazoline-2,4(1H,3H)-Diones through Carbonylation of 2-aminobenzonitrile and CO2 Quinazoline-2,4(1H,3H)-diones have wide applications in the synthesis of pharmaceuticals, such as Zenarestat, Prazosin, Doxazosin, and Bunazosin [72]. The synthesis of quinazoline-2,4(1H,3H)-dione derivatives through carbonylation of 2-aminobenzonitrile and CO2 is an environmentally benign process with 100% atom efficiency. This reaction was highlighted by Soleimani-Amiri et al. [72]. They classified the reactions based on the type of catalysts to review the works before 2017. Thus, we continued to summarise the published work in recent two years.PDF Image | Catalytic Conversion of Carbon Dioxide through C-N Bond
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