Stereoselective Synthesis of 5-Substituted Pyrrolo[1,2-c]imidazol-3-ones: Access to Annulated Chiral Imidazol(in)ium Salts
作者:Costa Metallinos、Shufen Xu
DOI:10.1021/ol902277y
日期:2010.1.1
two-step synthesis of N-heterocyclic carbene (NHC) precatalysts by diastereoselective or enantioselective lithiation of pyrrolo[1,2-c]imidazol-3-ones followed by POCl3-induced salt formation is described. The resulting 3-chloro-pyrroloimidazol(in)ium salts may be coordinated to palladium(II) upon NHC generation with t-BuLi at low temperature. The method may facilitate exploitation of these compounds as chiral
描述了通过吡咯并[1,2-c]咪唑-3-酮的非对映选择性或对映选择性锂化,然后由POCl 3诱导成盐的两步合成N-杂环卡宾(NHC)预催化剂的方法。生成的3-氯-吡咯并咪唑(盐)盐可以在低温下用t- BuLi生成NHC时与钯(II)配位。该方法可以促进将这些化合物用作金属催化中的手性有机催化剂或配体。