Isothiourea-catalyzed enantioselective functionalization of 2-pyrrolyl acetic acid : two-step synthesis of stereodefined dihydroindolizinones
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Catalytic enantioselective functionalization of 2-pyrrolyl acetic acid with trichloromethyl enones using isothiourea catalysis is reported, leading to a range of stereodefined diesters and diamides after nucleophilic ring-opening with either methanol or benzylamine (30 examples, up to >95:5 dr and >99:1 er). Subsequent intramolecular Friedel-Crafts reaction allows access to dihydroindolizinones in high yields and stereofidelity (6 examples, up to >95:5 dr and 99:1 er).
Zhang , S , Taylor , J E , Slawin , A M Z & Smith , A D 2018 , ' Isothiourea-catalyzed enantioselective functionalization of 2-pyrrolyl acetic acid : two-step synthesis of stereodefined dihydroindolizinones ' , Organic Letters , vol. In press . https://doi.org/10.1021/acs.orglett.8b02423
Copyright © 2018 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.orglett.8b02423
DescriptionJET thanks The Leverhulme Trust for an Early Career Fellowship [ECF-2014-005]. ADS thanks the Royal Society for a Wolfson Research Merit Award.
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