期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 29, 页码 13294-13301出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c04588
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资金
- Cancer Prevention and Research Institute of Texas (CPRIT) [RR200039]
- Welch Foundation [AA-2077-20210327]
- Baylor University
A new Lewis base-catalyzed bromochlorination strategy for unsaturated systems is described, which is mechanistically distinct and utilizes thionyl chloride as a latent chloride source in combination with as little as 1 mol % of triphenylphosphine or triphenylphosphine oxide as Lewis basic activators. This strategy exhibits excellent site selectivity and can access a wide variety of vicinal bromochlorides with high regio- and diastereoselectivity. The precision installation of Br, Cl, and I in various combinations is also demonstrated.
A new strategy is described for the Lewis base-catalyzed bromochlorination of unsaturated systems that is mechanistically distinct from prior methodologies. The novelty of this method hinges on the utilization of thionyl chloride as a latent chloride source in combination with as little as 1 mol % of triphenylphosphine or triphenylphosphine oxide as Lewis basic activators. This metal-free, catalytic chemo-, regio-, and diastereoselective bromochlorination of alkenes and alkynes exhibits excellent site selectivity in polyunsaturated systems and provides access to a wide variety of vicinal bromochlorides with up to > 20:1 regio-and diastereoselectivity. The precision installation of Br, Cl, and I in various combinations is also demonstrated by simply varying the commercial halogenating reagents employed. Notably, when a chiral Lewis base promoter is employed, an enantioselective bromochlorination of chalcones is possible with up to a 92:8 enantiomeric ratio when utilizing only 1-3 mol % of (DHQD)(2)PHAL.
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