Journal
ACS CATALYSIS
Volume 10, Issue 20, Pages 11963-11970Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c02731
Keywords
iron catalysis; hydroboration; alkenes; alkyl borates; regioselectivity; ligand-free
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Funding
- NSFS [21901059, 21978067, 21702119]
- Natural Science Foundation of Hebei Province [B2018208079, B2018208093]
- Hebei University of Science and Technology
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The control of regioselectivities has been recognized as the elementary issue for alkene hydroboration. Despite considerable progress, the specificity of alkene substrates or the adjustment of ligands was necessary for specific regioselectivities, which restrict the universality and practicability. Herein, we report a ligand-free iron-catalyzed regiodivergent hydroboration of aliphatic terminal alkenes that obtains both Markovnikov and anti-Markovnikov hydroboration products in high regioselectivities. Notably, solvents and bases were shown to be crucial factors influencing the regioselectivities and further studies suggested that the iron-boron alkoxide ate complex is the key intermediate that determines the unusual Markovnikov regioselectivity. Terminal alkenes with diverse structures (monosubstituted and 1,1-disubstituted, open-chain and exocyclic) underwent the transformation smoothly. The reaction does not require the addition of auxiliary ligands and it can be performed on a gram scale, thus providing an efficient and sustainable method for the synthesis of primary, secondary, and tertiary alkyl borates.
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