First asymmetric synthesis of planar chiral [2.2]metacyclophanes
作者:Marco Blangetti、Helge Müller-Bunz、Donal F. O'Shea
DOI:10.1039/c3cc42275e
日期:——
A general three step asymmetric synthesis of planar chiral [2.2]metacyclophanes utilizing selective benzylic and aryl metalations is described. The final enantioselective step is achieved using a (-)-sparteine mediated aryl metalation, following which electrophile reaction gives planar chiral cyclophanes with enantiomeric ratios (er) above 90 : 10.