Naturally occurring α-amino acid: a simple and inexpensive catalyst for the selective synthesis of 5-aryl-2-oxazolidinones from CO2 and aziridines under solvent-free conditions
Naturally occurring α-amino acid successfully catalyzed cycloaddition of aziridine with carbon dioxide to afford 5-aryl-2-oxazolisinones under mild conditions without the need of any additives. The scope of this reaction is very general, providing the corresponding products in good yields and excellent regioselectivity (87:13–100:0) regardless of the α-amino acid examined and a wide variety of N-substituted
could effectively catalyze the cycloaddition of CO2 and aziridines in the absence of additional co-catalyst, and it could maintain the catalytic activity after five cycles. Furthermore, 1 also exhibited high catalytic activity for the gram-scale experiment. Importantly, it is the first MOF material as a heterogeneous catalyst for the conversion of CO2 and aziridines without co-catalyst.
CO 2与氮丙啶的环加成反应是获得高价值产品的重要反应。多孔 MOF 可以催化该反应,但仍需要助催化剂来提高催化性能。这种由基于 MOF 的材料在没有助催化剂的情况下催化的反应迄今尚未见报道。在此,合成了一种多孔且稳定的三维(3D)骨架[Ni (DCTP)]·6.5DMF} n ( 1 ),其朗缪尔表面积为3,789 m 2 /g,显示出高I 2吸附能力高达 731.0 mg/g 并且可以可逆地释放。此外,它表现出104.0 cm 3的高 CO 2吸附容量/g at 273 K。研究结果表明,1可以在没有额外助催化剂的情况下有效地催化 CO 2和氮丙啶的环加成反应,并且可以在五个循环后保持催化活性。此外,1还表现出对克级实验的高催化活性。重要的是,它是第一种 MOF 材料,作为非共催化剂转化 CO 2和氮丙啶的非均相催化剂。
Regioselective synthesis of 5-aryl-2-oxazolidinones from carbon dioxide and aziridines using Br−Ph3+PPEG600P+Ph3Br− as an efficient, homogenous recyclable catalyst at ambient conditions
作者:Rahul A. Watile、Dattatraya B. Bagal、Yogesh P. Patil、Bhalchandra M. Bhanage
DOI:10.1016/j.tetlet.2011.09.056
日期:2011.11
phosphonium salt (Br−Ph3+PPEG600P+Ph3Br−) was found to be an efficient, homogenous, recyclable catalyst for coupling of CO2 with a variety of aziridines producing corresponding 5-aryl-2-oxazolidinones with good yields and excellent regioselectivity under relatively mild and solvent free conditions. Furthermore, the catalyst was effectively recycled for four consecutive cycles without any significant loss in
聚乙二醇官能化鏻盐(BR -博士3 + PPEG 600 P +博士3溴- )被发现是一种有效的,均匀的,可回收催化剂对CO的耦合2与各种相应的5-芳基-2-恶唑烷酮制备氮丙啶的在相对温和且无溶剂的条件下,具有良好的收率和出色的区域选择性。此外,该催化剂有效地再循环了四个连续的循环,而其催化活性和选择性没有任何明显的损失。
Polystyrene‐Supported Amino Acids as Efficient Catalyst for Chemical Fixation of Carbon Dioxide
作者:Chaorong Qi、Jinwu Ye、Wei Zeng、Huanfeng Jiang
DOI:10.1002/adsc.201000261
日期:2010.10.9
polystyrene-supported aminoacids have been synthesized and applied to the chemicalfixation of carbondioxide for the first time. Two series of experiments with polystyrene-supported threonine (PS-Thr) and polystyrene-supported tyrosine (PS-Tyr) as catalyst, respectively, were conducted to study the effect of the reaction conditions on the carboxylation of propylene oxide/carbondioxide. There was no considerable
efficiently promoted by ruthenium(VI) imidoporphyrin complexes and yields a mixture of 5‐aryl (A) and 4‐aryl (B) substituted oxazolidin‐2‐ones with a regioisomeric A/B ratio up to 99:1. Several oxazolidin‐2‐one molecules were synthesized at 100 °C and 0.6 MPa of carbondioxide by using the low catalytic loading of 1 mol‐%. The formation of a deactivated compound, deriving from the ruthenium catalyst, suggested