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    FeCl<sub>3</sub>‑Promoted [3 + 2] Annulations of γ‑Butyrolactone Fused Cyclopropanes with Heterocumulenes

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    The [3 + 2] annulations of γ-butyrolactone fused donor–acceptor (D–A) cyclopropanes with aromatic isothiocyanates and dialkyl carbodiimides promoted by FeCl<sub>3</sub> is reported. A series of bicyclic/polycyclic γ-butyrolactone fused thioimidates and γ-butyrolactone fused amidines containing four contiguous stereogenic centers were obtained in excellent yields as single stereoisomers
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