Isothiourea-catalysed enantioselective Michael addition of N-heterocyclic pronucleophiles to α,β-unsaturated aryl esters

Chang Shu, Honglei Liu, Alexandra Slawin, Cameron L. Carpenter-Warren, Andrew David Smith

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31 Citations (Scopus)
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Abstract

The isothiourea-catalysed enantioselective Michael addition of 3-aryloxindole and 4-substituted-dihydropyrazol-3-one pronucleophiles to α,β-unsaturated p-nitrophenyl esters is reported. This process generates products containing two contiguous stereocentres, one quaternary, in good yields and excellent enantioselectivities (>30 examples, up to > 95 : 5 dr and 99 : 1 er). This protocol harnesses the multifunctional ability of p-nitrophenoxide to promote effective catalysis. In contrast to previous methodologies using tertiary amine Lewis bases, in which the pronucleophile was used as the solvent, this work allows bespoke pronucleophiles to be used in stoichiometric quantities.
Original languageEnglish
Number of pages7
JournalChemical Science
VolumeAdvance Article
Early online date23 Oct 2019
DOIs
Publication statusE-pub ahead of print - 23 Oct 2019

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