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
中科院分区:
文献类型:
--
作者:
Grigg RD;Van Hoveln R;Schomaker JM
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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