期刊
ACS CATALYSIS
卷 10, 期 21, 页码 13075-13083出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c03622
关键词
copper catalysis; hydroborations; benzylidenecyclobutanes; 4-membered rings; tertiary boronic esters; modified dppbz ligands; heterocycle
资金
- National Institutes of Health [5R35GM125052-02, R35GM128779]
- Scripps Research Institute
- Pfizer, Inc.
- Kwanjeong Educational Foundation (Graduate Fellowship)
A unified synthetic strategy to access tertiary four-membered carbo/heterocyclic boronic esters is reported. The use of a Cu(I) catalyst in combination with a modified 1,2-bis(diphenylphosphino)benzene (dppbz) ligand enables regioselective hydroboration of various trisubstituted benzylidenecyclobutanes and carbo/heterocyclic analogs. The reaction conditions are mild, and the method tolerates a wide range of medicinally relevant heteroarenes. The protocol can be conveniently conducted on a gram scale, and the tertiary boronic ester products undergo facile diversification into valuable targets. Reaction kinetics and computational studies indicate that the migratory insertion step is turnover-limiting and accelerated by electron-withdrawing groups on the dppbz ligand. Energy decomposition analysis calculations reveal that electron-deficient P-aryl groups on the dppbz ligand enhance the T-shaped pi/pi interactions with the substrate and stabilize the migratory insertion transition state.
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