Twice the catalyst: The simultaneous activation of an allyl cyanide (pronucleophile) and an α,β‐unsaturated thioamide (electrophile) was achieved using a Cu‐based soft Lewis acid/hard Brønsted base cooperative catalyst, thus resulting in the formation of enethioamides 1 in a highly enantio‐ and Z‐selective manner (see scheme). The sequential Cu‐catalyzed intramolecular cyclization gave rise to enantioenriched fused isothiazoles 2.
Doppelt gut: Die simultane Aktivierung eines Allylcyanids (Pränucleophil) und α,β‐ungesättigter Thioamide (Elektrophile) gelang mit einem kooperativen Katalysator auf der Basis einer weichen Lewis‐Säure und einer harten Brønsted‐Base, wodurch die Enthioamide 1 hoch enantio‐ und Z‐selektiv erhalten wurden (siehe Schema). Die sequenzielle Cu‐katalysierte intramolekulare Cyclisierung lieferte enantiomerenangereicherte anellierte Isothiazole 2.
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