Enantioselective Conjugate Addition Greatly Improves the Synthesis of (+)-Confertin
作者:Gerhard Quinkert、Thomas Müller、Andreas Königer、Oliver Schultheis、Birgitt Sickenberger、Gerd Dürner
DOI:10.1016/s0040-4039(00)92665-0
日期:1992.6
The five-membered ring building blocks 2+3 are enantioselectively produced by conjugate addition of a chiral ligand-modified organocuprate to 2-methylcyclopent-2-enone (1) (chemical yield: 88%; e.e.: 88%) and successfully converted in a multi-step sequence, after final enantioselection by recrystallization of an appropriate intermediate, into the pseudoguaianolide (+)-confertin (5).