Efficient Synthesis of Cyclic Carbonates from Unsaturated Acids and Carbon Dioxide and their Application in the Synthesis of Biobased Polyurethanes
作者:Javier Martínez、Felipe Cruz‐Martínez、Marc Martínez de Sarasa Buchaca、Juan Fernández‐Baeza、Luis F. Sánchez‐Barba、Michael North、José A. Castro‐Osma、Agustín Lara‐Sánchez
DOI:10.1002/cplu.202100079
日期:2021.3
Bio‐derived furan‐ and diacid‐derived cyclic carbonates have been synthesized in high yields from terminal epoxides and CO2. Furthermore, four highly substituted terpene‐derived cyclic carbonates were isolated in good yields with excellent diastereoselectivity in some cases. Eleven new cyclic carbonates derived from 10‐undecenoic acid under mild reaction conditions were prepared, providing the corresponding
生物衍生的呋喃和二酸衍生的环状碳酸酯已经由末端环氧化物和 CO 2以高产率合成。此外,在某些情况下,以良好的收率和出色的非对映选择性分离了四种高度取代的萜烯衍生环状碳酸酯。在温和的反应条件下,由 10-十一碳烯酸衍生制备了 11 种新的环状碳酸酯,以优异的收率提供了相应的碳酸酯产品。该催化剂体系还在相对温和的反应条件(80°C,20 bar,24 小时)下将环氧化脂肪酸正戊酯转化为环状碳酸酯。这种双(环状碳酸酯)以高产率和不同的顺式/反式获得比例取决于所用的助催化剂。当双(三苯基膦)亚胺氯化物用作助催化剂时,仅观察到烯丙醇副产物作为次要产物。最后,使用两种环状碳酸酯作为结构单元,通过与 1,4-二氨基丁烷反应制备非异氰酸酯聚(羟基)氨基甲酸酯。
Enantioselective Incorporation of Carbon Dioxide into Epoxides Catalyzed by Optically Active Cobalt(II) Complexes
into an epoxide was developed using an opticallyactive ketoiminatocobalt(II) complex as a chiral Lewis acid. In the presence of a catalytic amount of the cobalt complex and amine base, enantioselective CO 2 fixation with an epoxide proceeded with kineticresolution to afford the corresponding carbonate along with unreacted epoxide, both of which were opticallyactive. To improve their enantioselectivities
使用光学活性的酮亚氨基钴 (II) 配合物作为手性路易斯酸开发了 CO 2 对映选择性化学固定到环氧化物中。在催化量的钴络合物和胺碱的存在下,与环氧化物的对映选择性 CO 2 固定进行动力学拆分,得到相应的碳酸盐和未反应的环氧化物,两者都是光学活性的。为了提高它们的对映选择性,研究了钴配合物和胺碱的配体结构。因此,优化的催化体系成功地应用于各种环氧化物,以获得相应的光学活性环状碳酸酯,并以良好的对映选择性回收环氧化物。
Quaternary Alkyl Ammonium Salt-Catalyzed Transformation of Glycidol to Glycidyl Esters by Transesterification of Methyl Esters
作者:Shinji Tanaka、Takuya Nakashima、Toshie Maeda、Manussada Ratanasak、Jun-ya Hasegawa、Yoshihiro Kon、Masanori Tamura、Kazuhiko Sato
DOI:10.1021/acscatal.7b03303
日期:2018.2.2
ring-opening reaction of the epoxide. Computational studies of the reaction mechanism indicated that the alkoxide anion derived from glycidol tends to abstract the proton of another glycidol rather than work as a nucleophile, initiating the catalytic transesterification. Payne rearrangement of the deprotonated glycidol, which produces a destabilized base that promotes nonselective reactions, is energetically
Hydroxylated N-alkyl-4-piperidinyl-2,3-diarylpyrrole derivatives as potent broad-spectrum anticoccidial agents
作者:Gui-Bai Liang、Xiaoxia Qian、Tesfaye Biftu、Dennis Feng、Michael Fisher、Tami Crumley、Sandra J. Darkin-Rattray、Paula M. Dulski、Anne Gurnett、Penny Sue Leavitt、Paul A. Liberator、Andrew S. Misura、Samantha Samaras、Tamas Tamas、Dennis M. Schmatz、Matthew Wyvratt
DOI:10.1016/j.bmcl.2005.06.096
日期:2005.10
Diaryl-(4-piperidinyl)-pyrrole derivatives bearing hydroxylated N-alkyl substituents have been synthesized and evaluated as anticoccidial agents. High potency in Et-PKG inhibition and broad-spectrum anticoccidial activities have been observed on compounds, such as 4b and 5h, which are fully efficacious in vivo at 50 ppm in feed. (c) 2005 Elsevier Ltd. All rights reserved.