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2005
Pyrrole derivatives
R 0120
Dynamic Resolution of N-Alkyl-2-lithiopyrrolidines with the Chiral Ligand
— Dynamic resolution of 2-lithiopyrrolidines takes place at ambient
31- 122 (-)-Sparteine.
temperature in the presence of (—)-sparteine with good levels of enantioselectivity.
The best results are achieved with branched N-alkyl derivatives. The asymmetric induction is found to be the result of a dynamic thermodynamic resolution in which the
minor diastereomeric intermediate reacts faster with the electrophile. —
(COLDHAM*, I.; DUFOUR, S.; HAXELL, T. F. N.; VENNALL, G. P.; Tetrahedron
61 (2005) 13, 3205-3220; Dep. Chem., Univ. Sheffield, Sheffield S3 7HF, UK; Eng.)
— Klein
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