Organocatalytic Michael addition–lactonisation of carboxylic acids using α,β-unsaturated trichloromethyl ketones as α,β-unsaturated ester equivalents
Abstract
Isothiourea HBTM-2.1 catalyses the Michael addition-lactonisation of 2-aryl and 2-alkenylacetic acids and α,β-unsaturated trichloromethyl ketones. Ring-opening of the resulting dihydropyranones and subsequent alcoholysis of the CCl ketone with an excess of methanol gives a range of diesters in high diastereo- and enantioselectivity (up to 95:5 dr and >99% ee). Sequential addition of two different nucleophiles to a dihydropyranone gives the corresponding differentially substituted diacid derivative.
Citation
Morrill , L C , Stark , D G , Taylor , J E , Smith , S R , Squires , J A , D'Hollander , A C A , Simal Fernandez , C , Shapland , P , O'Riordan , T J C & Smith , A D 2014 , ' Organocatalytic Michael addition–lactonisation of carboxylic acids using α,β-unsaturated trichloromethyl ketones as α,β-unsaturated ester equivalents ' , Organic & Biomolecular Chemistry , vol. 12 , no. 44 , pp. 9016-9027 . https://doi.org/10.1039/c4ob01788a
Publication
Organic & Biomolecular Chemistry
Status
Peer reviewed
ISSN
1477-0520Type
Journal article
Description
The authors thank the Royal Society for a University Research Fellowship (ADS), The Carnegie Trust for the Universities of Scotland (LCM), Syngenta/EPSRC (Case award to DGS), GSK/EPSRC (CASE award to SRS), the EU (IEF for CS), and the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013) ERC Grant Agreement no. 279850 (JET) for funding.Collections
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