The barrier to enantiomerization of N-Boc-2-lithiopyrrolidine: the effect of chiral and achiral diamines

Literature Information

Publication Date 2007-11-15
DOI 10.1039/B714302H
Impact Factor 6.222
Authors

Taher I. Yousaf, Iain Coldham, Robert E. Gawley


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Abstract

(−)-Sparteine and TMEDA dramatically lower both enthalpy and entropy of activation for the barrier to enantiomerization of N-Boc-2-lithiopyrrolidine in diethyl ether, whereas N,N′-diisopropyl bispidine has little effect; the entropy of activation for enantiomerization is zero in the presence of TMEDA and slightly negative in the presence of sparteine; these data suggest a subtle change in mechanism of enantiomerization in the presence of TMEDA and sparteine.

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