Carbon Dioxide as a Carbonylating Agent in the Synthesis of 2-Oxazolidinones, 2-Oxazinones, and Cyclic Ureas: Scope and Limitations
作者:Jairo Paz、Carlos Pérez-Balado、Beatriz Iglesias、Luis Muñoz
DOI:10.1021/jo100268n
日期:2010.5.7
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 phosphorylating agents such as Diphenylphosphoryl azide (DPPA) and Diphenyl chlorophosphate (DPPCl) but also with other types of electrophiles such
在2-恶唑烷酮,2-恶嗪酮和环状脲的合成中,二氧化碳可用作方便的羰基化剂。通过在碱性介质中处理伯胺或仲胺基团而生成的瞬态氨基甲酸酯阴离子可以用磷酸化剂(如二苯基磷酰叠氮化物(DPPA)和二苯基氯代磷酸酯(DPPC1))活化,也可以用其他类型的亲电试剂(如SOCl 2,TsCl或氯化铝。羟基将活化的氨基甲酸酯分子内捕获导致形成2-恶唑烷酮或2-恶嗪酮,产率高至优异。该方法已成功地用于从相应的二胺合成高达7元环的环状脲。