Abstract
The steric-switched ipso-defluoroamination-triggered and ipso-defluorooxylation-triggered cyclization of (trifluoromethyl)alkenes with amino alcohols and diamines are achieved under mild conditions. This regioselective strategy distinguishes the different nucleophilic heteroatom sites in amino alcohols and unsymmetric diamines by the sequential defluorinative functionalization of two C(sp3)-F bonds in a CF3 group. Various attractive monofluoroalkene-masked medium-sized heterocyclic lactams and lactones are obtained in moderate to excellent yields. Simple derivation of these masked-heterocycles efficiently affords useful skeletons of lactams, lactones, and 1,4-oxazepanes in a single diastereoisomer. Mechanism studies indicate that a unique sequential ipso-/γ-selective defluorinative functionalization pathway is involved in these transformations.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21702064) and the Guangdong Basic and Applied Basic Research Foundation (2020B1515020012).
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Zeng, H., Li, H., Jiang, H. et al. Steric-switched defluorofunctionalization selectivity: controlled synthesis of monofluoroalkene-masked medium-sized heterocyclic lactams and lactones. Sci. China Chem. 65, 554–562 (2022). https://doi.org/10.1007/s11426-021-1135-8
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DOI: https://doi.org/10.1007/s11426-021-1135-8