A Simple and Efficient Procedure for the Preparation of Chiral 2-Oxazolidinones from α-Amino Acids
作者:Norman Lewis、Alexander McKillop、Richard J. K. Taylor、Robert J. Watson
DOI:10.1080/00397919508011390
日期:1995.2
Abstract A modified procedure for the title transformation is described which avoids: (i) a potentially hazardous borane reduction step, and (ii) the intermediacy of water soluble amino alcohols.
摘要 描述了标题转化的改进程序,它避免了:(i) 潜在危险的硼烷还原步骤,和 (ii) 水溶性氨基醇的中间体。
Carbon Dioxide as a Carbonylating Agent in the Synthesis of 2-Oxazolidinones, 2-Oxazinones, and Cyclic Ureas: Scope and Limitations
Carbon dioxide can be used as a convenient carbonylating agent in the synthesis of 2-oxazolidinones, 2-oxazinones, and cyclic ureas. The transient carbamate anion generated by treating a primary or secondary amine group in basic media can be activated with phosphorylatingagents such as Diphenylphosphoryl azide (DPPA) and Diphenyl chlorophosphate (DPPCl) but also with other types of electrophiles such
Dehydrative synthesis of chiral oxazolidinones catalyzed by alkali metal carbonates under low pressure of CO2
作者:Siong Wan Foo、Yuki Takada、Yusuke Yamazaki、Susumu Saito
DOI:10.1016/j.tetlet.2013.06.100
日期:2013.8
Dehydrative synthesis of oxazolidinones from amino alcohols and CO2 was achieved in the presence of alkalimetal carbonates such as Cs2CO3 as catalyst. It is noteworthy that 1 atm of CO2 is enough for the reaction to proceed and no special dehydrating agent is required in this system. A mechanstic study showed that the OH of amino alcohol acts as nucleophile and the OH in the carbamic acid moiety is
在碱金属碳酸盐如Cs 2 CO 3作为催化剂的存在下,由氨基醇和CO 2脱水合成了恶唑烷酮。值得注意的是,1atm的CO 2足以进行反应,并且在该系统中不需要特殊的脱水剂。力学研究表明,氨基醇的OH充当亲核试剂,氨基甲酸部分中的OH在环化过程中释放出来。
Catalytic fluoride triggers dehydrative oxazolidinone synthesis from CO<sub>2</sub>
作者:Yuki Takada、Siong Wan Foo、Yusuke Yamazaki、Susumu Saito
DOI:10.1039/c4ra09609f
日期:——
Herein, catalytic fluoride (F−) is demonstrated to be a trigger for dehydrative immobilization of atmospheric pressure CO2, such that reaction of CO2 with β-amino alcohols derived from natural amino acids gives optically pure oxazolidinones in high yields. A synergistic combination of fluoride and organosilicon agents (e.g., Bu4NF + Ph3SiF or siloxanes) enhances the catalytic activity and functional group compatibility. This system lies at the interface between homogenous and heterogeneous catalysis, and may prove useful for the development of recoverable/reusable siloxane-based CO2 immobilization materials.
Decarboxylative ring-opening of 2-oxazolidinones: a facile and modular synthesis of β-chalcogen amines
作者:Fábio Z. Galetto、Cleiton da Silva、Ricardo I. M. Beche、Renata A. Balaguez、Marcelo S. Franco、Francisco F. de Assis、Tiago E. A. Frizon、Xiao Su
DOI:10.1039/d2ra06070a
日期:——
We report herein the synthesis of primary and secondary β-chalcogen amines through the regioselective ring-opening reaction of non-activated 2-oxazolidinones promoted by in situ generated chalcogenolate anions. The developed one-step protocol enabled the preparation of β-selenoamines, β-telluroamines and β-thioamines with appreciable structural diversity and in yields of up to 95%.