Main observation and conclusion

In this study, we communicate a Pd(II)-catalyzed Markovnikov hydroalkynylation of unactivated terminal alkenes, which provides an efficient method to access branched alkynes in good yields and excellent regioselectivity, where IBX was used as alkynyl reagent and hydrosilane as reducing reagent. After the initial alkene insertion into alkynyl-Pd(II) species, the generated alkyl-Pd(II) was reduced by hydrosilane to give the hydroalkynylation product efficiently. Notably, a pyridine-oxazoline (Pyox) plays a key role in the reactivity and selectivity.

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