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

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Figure

Fig. 1Screening of pronucleophiles. Isolated overall yields given; drdetermined by chiral HPLC analysis of puridetermined by 1H NMR spectroscopic analysis of crude mixture; erfied products and refers toer of major diastereoisomer.
Fig. 2(Aby–E) Scope and limitations: 3-aryloxindole pronucleophiles and a,b-unsaturated aryl esters.a Isolated overall yields given; dr determined 1H NMR spectroscopic analysis of crude mixture; er determined by chiral HPLC analysis.b Reaction carried out at �40 �C.

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