en
Scientific article
English

Asymmetric Synthesis of Planar Chiral (Arene)tricarbonylchromium Complexes via Enantioselective Deprotonation by Conformationally Constrained Chiral Lithium-Amide Bases

Published inHelvetica chimica acta, vol. 83, no. 9, p. 2436-2451
Publication date2000
Abstract

Enantioselective lithiation/electrophile addition reactions with eight chiral Li-amide bases, 1 - 8, and five [Cr(arene)(CO)3] complexes, 9 - 13, were investigated. Restriction of conformational freedom in the chiral Li-amide base Li-1, in general, did not result in an increase in asymmetric induction. A new route to enantiomerically enriched (75 - 92%) planar chiral ortho-substituted benzaldehyde complexes via enantioselective lithiation of benzaldimine complexes 16 and 17 is reported. Within the (1S)-enantiomer series of o-substituted benzaldehyde complexes 18a - d, the sign of the specific rotation, [a], is found to be positive, except for the trimethylstannyl derivative 18b. This is interpreted in terms of a reversed conformation of the aldehyde group.

Citation (ISO format)
PACHE, Sandrine et al. Asymmetric Synthesis of Planar Chiral (Arene)tricarbonylchromium Complexes via Enantioselective Deprotonation by Conformationally Constrained Chiral Lithium-Amide Bases. In: Helvetica chimica acta, 2000, vol. 83, n° 9, p. 2436–2451. doi: 10.1002/1522-2675(20000906)83:9%3C2436::AID-HLCA2436%3E3.0.CO;2-N
Main files (1)
Article
accessLevelRestricted
ISSN of the journal0018-019X
535views
0downloads

Technical informations

Creation21/06/2010 10:27:59
First validation21/06/2010 10:27:59
Update time14/03/2023 15:46:51
Status update14/03/2023 15:46:51
Last indexation12/02/2024 18:42:54
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack