Phosphorus oxychloride as an efficient coupling reagent for the synthesis of esters, amides and peptides under mild conditions
作者:Hu Chen、Xunfu Xu、Liu Leo Liu、Guo Tang、Yufen Zhao
DOI:10.1039/c3ra42887g
日期:——
A mild method is described for the conversion of carboxylic acids into esters, amides, as well as peptides without racemization through carboxyl activation by the reagent combination of POCl3 and DMAP. Long chain alcohols could be converted to the corresponding ester in good yields. 31P NMR spectrum was used to detect phosphorus-containing intermediates in ongoing reactions directly, and a possible
描述了一种温和的方法,可通过POCl 3和地图。长链醇可以良好的产率转化为相应的酯。31 P NMR光谱用于直接检测正在进行的反应中的含磷中间体,并基于这些结果提出了可能的机理。
Rh-catalyzed alkoxycarbonylation of unactivated alkyl chlorides
Crucial for this transformation is the addition of sodium iodide, which provides in situ more active alkyl iodides. In the presence of a Rh(I)-DPPP catalyst system diverse esters (81 examples) including industrially relevant acetates from chloro- and dichloromethane can be prepared in a straightforward manner in up to 95% isolated yield. The used ligand not only affects the selectivity of the carbonylation