Copper-catalyzed recycling of halogen activating groups via 1,3-halogen migration.

Copper-catalyzed recycling of halogen activating groups via 1,3-halogen migration.
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DOI:
10.1021/ja306446m
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发表时间:
2012-10-03
影响因子:
15
通讯作者:
Schomaker JM
Schomaker JM
中科院分区:
化学1区
文献类型:
--
作者:
Grigg RD;Van Hoveln R;Schomaker JM

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Cu(I)催化的1,3-卤素迁移反应通过将溴或碘从sp转移到苯甲基碳并伴随Ar-X键的硼基化来有效地回收活化基团。所得苄基卤可在相同容器中在各种条件下反应以形成额外的碳-杂原子键。使用同位素富集的溴化物源的交叉实验支持Br的分子内转移。该反应被假定为通过邻卤代苯乙烯的马可夫氢化铜化、所得Cu(I)络合物氧化加成到Ar-X键中、新的sp C-X键的还原消除和最终Ar-Cu(I)物质的硼基化以翻转催化循环来进行。
A Cu(I)-catalyzed 1,3-halogen migration reaction effectively recycles an activating group by transferring bromine or iodine from a sp to a benzylic carbon with concomitant borylation of the Ar-X bond. The resulting benzyl halide can be reacted in the same vessel under a variety of conditions to form an additional carbon-heteroatom bond. Cross-over experiments using an isotopically enriched bromide source support intramolecular transfer of Br. The reaction is postulated to proceed via a Markovnikov hydrocupration of the o-halostyrene, oxidative addition of the resulting Cu(I) complex into the Ar-X bond, reductive elimination of the new sp C-X bond, and final borylation of an Ar-Cu(I) species to turn over the catalytic cycle.
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