Communication
ChemComm
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In summary, we have developed the first silver-promoted
imino-phosphorylation of g,d-unsaturated oxime esters via a
cascade radical cyclization, which allows for the efficient and
straightforward construction of various phosphine-containing
pyrrolines in good to excellent yields under oxidant-free conditions.
Moreover, this reaction could be easily performed on a gram scale
and the resulting phosphorylated pyrrolines were useful for
further transformations. Most importantly, this strategy offers a
novel method to construct new bulky trivalent phosphine
ligands with a pyrroline motif, which was difficult to synthesize
using other methods. Further investigations on the scope of
imino-functionalization of g,d-unsaturated oxime esters are
currently underway in our laboratory.
We gratefully acknowledge the National Natural Science
Foundation of China (21901184 and 21572160); the Science &
Technology Development Fund of Tianjin Education Commission
for Higher Education (2018KJ159) and the Program for Innovative
Research Team in University of Tianjin (TD13-5074) for generous
financial support. We also thank Prof. Xiaofeng Tong (Changzhou
University) for helpful discussions.
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14700 | Chem. Commun., 2019, 55, 14697--14700
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