Elumalai Ezhilgnanadevi

(3 + 2) Annulation of Indane-1,3-Dione-Based Spiro Donor–Acceptor Cyclopropanes with Thioureas: Entry to Iminodihydrothiophenes and Thienobenzazepinediones

Abstract Spiro donor–acceptor cyclopropanes (DACs) based on an indane-1,3-dione moiety underwent atypical ring cleavage during their Yb(OTf)3-catalyzed (3 + 2) annulation with thioureas. The gem-diamino tetrahydrothiophene intermediates initially formed in the annulation spontane...