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phosphoric acid, as indicated by the results of the enantio-
selective catalytic version (eq 5).
In conclusion, we have established a highly stereoselective
allylation of aldehydes with simple acyclic alkenes, wherein a
wide scope of aldehydes and acyclic or cyclic alkenes are nicely
tolerated. The reaction is basically a cascade process consisting of
a Pd-catalyzed allylic C−H borylation and an allylation of
aldehydes. Actually, the oxidants play a key role in the realization
of the allylic C−H activation step. The Brønsted acid was able to
catalyze the allylation reaction and hence to facilitate the whole
process. More importantly, the enantioselective version could be
accessed using chiral Brønsted acids as co-catalysts. Improve-
ment of the enantioselectivity and applications of the concept to
the creation of new transformations involving allylic C−H
activation are now being actively pursued.
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ASSOCIATED CONTENT
* Supporting Information
Complete experimental procedures and characterization data for
the prepared compounds. This material is available free of charge
■
S
AUTHOR INFORMATION
Corresponding Author
Notes
■
The authors declare no competing financial interest.
ACKNOWLEDGMENTS
We are grateful for financial support from MOST (973 project
2015CB856600) and NSFC (21232007).
■
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