The utilization of a halogen bond
in a number of chemical fields
is well-known. Surprisingly, the incorporation of this useful noncovalent
interaction in chemical reaction engineering is rare. We disclose
here an uncommon use of halogen bonding to induce intermolecular Csp
3–H amination while enabling a hydrogen
atom transfer relay strategy to access privileged pyrrolidine structures
directly from alkanes. Mechanistic studies support the presence of
multiple halogen bond interactions at distinct reaction stages.
A novel iodide-catalyzed
intermolecular aminooxygenation strategy
is described here. Amide is used as the O- and N- source to probe
for regiocontrol strategies. Notably, simple additives can be selectively
introduced to achieve regiodivergent oxyamination processes for electronically
activated alkenes while being regio-complementary for unactivated
alkenes. Our preliminary data demonstrates that this regiocontrol
strategy based on nucleophile can also be applied in asymmetric processes
using chiral hypervalent iodine catalysis.
A new class of intermolecular olefin aminooxygenation reaction is described. This reaction utilizes the classic halonium intermediate as a regio‐ and stereochemical template to accomplish the selective oxyamination of both activated and unactivated alkenes. Notably, urea chemical feedstock can be directly introduced as the N and O source and a simple iodide salt can be utilized as the catalyst. This formal [3+2] cycloaddition process provides a highly modular entry to a range of useful heterocyclic products with excellent selectivity and functional‐group tolerance.
An intermolecular sulfenoamination reaction utilizing a stable sulfur precursor with a broad range of alkene structures is described. More importantly, these reactions proceed in a highly regio- and stereoselective manner to afford interesting heterocyclic motifs ready for biological studies. In addition, a highly regiodivergent approach to access the opposite regioisomers for styrene derivatives was also developed.
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