The barrier to enantiomerization and dynamic resolution of N-Boc-2-lithiopiperidine and the effect of TMEDA†
Iain Coldham,Daniele Leonori,Timothy K. Beng,Robert E. Gawley
Chemical Communications Pub Date : 08/06/2009 00:00:00 , DOI:10.1039/B911024K
Abstract
The kinetics of enantiomerization and dynamic thermodynamic resolution (DTR) of N-Boc-2-lithiopiperidine have been measured, revealing significant differences in enthalpy and entropy for these processes and a role for the achiral ligand TMEDA; the racemization and the DTR are catalytic and first order in [TMEDA], and this has implications for asymmetric synthesis with chiral organolithiums.