Quinidine-Catalysed Enantioselective Synthesis of 6- and 4-Trifluoromethyl-Substituted Dihydropyrans
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The cinchona alkaloid-catalysed enantioselective formal [4+2] cycloaddition of ethyl 2,3-butadienoate with a range of 1,1,1-trifluoro- and 4,4,4-trifluorobutenones is investigated for the preparation of stereodefined 6- and 4-trifluoromethyl-substituted dihydropyrans. Quinidine proved to be the optimal catalyst, generating the desired products in up to 98 % ee and 81 % yield. Stereo- and chemoselective derivatization of the dihydropyrans through hydrogenation is explored.
Kasten , K , Cordes , D B , Slawin , A M Z & Smith , A D 2016 , ' Quinidine-Catalysed Enantioselective Synthesis of 6- and 4-Trifluoromethyl-Substituted Dihydropyrans ' European Journal of Organic Chemistry , vol 2016 , no. 21 . DOI: 10.1002/ejoc.201600583
European Journal of Organic Chemistry
Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1002/ejoc.201600583
The authors thank the Royal Society for a University Research Fellowship (ADS) and the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013), ERC Grant Agreement No. 279850 (KK), the authors also thank the EPSRC UK National Mass Spectrometry Facility at Swansea University.
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