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Precise structure activity relationships in asymmetric catalysis using carbohydrate scaffolds to allow ready fine tuning: dialkylzinc–aldehyde additions†
Daniel P. G. Emmerson,Renaud Villard,Claudia Mugnaini,Andrei Batsanov,Judith A. K. Howard,William P. Hems,Robert P. Tooze,Benjamin G. Davis
Organic & Biomolecular Chemistry Pub Date : 10/07/2003 00:00:00 , DOI:10.1039/B309715N
Abstract

The ready construction of 24 stereochemically and functionally diverse carbohydrate ligand structures from a core D-glucosamine scaffold has allowed the evaluation of broad ranging structure activity relationships in ligand accelerated zincate additions to aldehydes, with variations in ΔΔG(R-S) of up to 5650 J mol−1 that create opposing senses of asymmetric induction and that are consistent with models based on several ligand X-ray structures and molecular mechanics analysis. Factorial analysis of enantioselectivity using key dihedral angles and steric volume on N-2 also highlight the potential for the use of factorial design in ligand construction.

Graphical abstract: Precise structure activity relationships in asymmetric catalysis using carbohydrate scaffolds to allow ready fine tuning: dialkylzinc–aldehyde additions
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