C-Boron Enolates Enable Palladium Catalyzed Carboboration of Internal 1,3-Enynes.
C-Boron Enolates Enable Palladium Catalyzed Carboboration of Internal 1,3-Enynes.
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DOI:
10.1002/anie.202108534
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发表时间:
2021-09-20
期刊:
影响因子:
--
通讯作者:
Liu SY
中科院分区:
文献类型:
--
作者:
Wang Z;Wu J;Lamine W;Li B;Sotiropoulos JM;Chrostowska A;Miqueu K;Liu SY
A new family of carbon-bound boron enolates, generated by a kinetically controlled halogen exchange between chlorocatecholborane and silylketene acetals, is described. These C-boron enolates are demonstrated to activate 1,3-enyne substrates in the presence of a Pd(0)/Senphos ligand complex, resulting in the first examples of a carboboration reaction of an alkyne with enolate-equivalent nucleophiles. Highly substituted dienyl boron building blocks are produced in excellent site-, regio-, and diastereoselectivity by the described catalytic cis-carboboration reaction. A new family of carbon-bound boron enolates, in cooperation with a Pd complex supported by an 1,4-azaborine-derived phosphine ligand, transforms enynes into highly substituted dienyl boronates in exquisite site-, regio-, and cis-diastereoselectivity.
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