作者:Yumiko Suzuki、Kazuyuki Muramatsu、Kaori Yamauchi、Yasuko Morie、Masayuki Sato
DOI:10.1016/j.tet.2005.09.071
日期:2006.1
N-heterocyclic carbenes are generated from C2-symmetric 1,3-bis(1-arylethyl)imidazolium salts and potassium tert-butoxide. These C2-symmetric imidazolidenyl carbenes catalyze enantioselective acylation of racemic secondary alcohols. The asymmetric acylation of 1-(1-naphthyl)ethanol was achieved in up to 68% ee of the acylated product, using (R,R)-1,3-bis[(1-naphthyl)ethyl]imidazolium tetrafluoroborate as a precursor
由C 2对称的1,3-双(1-芳乙基)咪唑鎓盐和叔丁醇钾产生手性N-杂环卡宾。这些C 2对称的咪唑烷烯基碳烯催化外消旋仲醇的对映选择性酰化。使用(R,R)-1,3-双[(1-萘基)乙基]咪唑四氟硼酸酯作为前体,可以在不超过68%ee的酰化产物中实现1-(1-萘基)乙醇的不对称酰化。手性N-杂环卡宾和丙酸乙烯酯作为酰基供体。