Copper-Catalyzed C(sp3)–H Methylation via Radical Relay

Copper-Catalyzed C(sp3)–H Methylation via Radical Relay
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通过自由基中继的铜催化 C(sp3)→H 甲基化

DOI:
10.1021/acscatal.2c02474
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发表时间:
2022
期刊:
影响因子:
12.9
通讯作者:
Warren, Timothy H.
Warren, Timothy H.
中科院分区:
化学1区
文献类型:
--
作者:
Figula, Bryan C.;Chen, Ting-An;Bertke, Jeffery A.;Warren, Timothy H.

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甲基部分是关键官能团,其可以导致药剂的效力和选择性的重大改进。我们提出了一种自由基中继C-H甲基化方法,该方法采用能够甲基化未活化的C(sp3)-H键的β-二酮亚胺铜催化剂。利用工作台稳定的DABAL-Me 3,一种胺稳定的三甲基铝试剂,一系列具有活化和未活化C(sp3)-H键的底物的甲基化以最小量的过度甲基化进行。由实验和计算支持的机理研究表明,甲基铜(II)中间体对甲基自由基的损失以及自由基R·的捕获以形成R-Me键都具有反应性。
The methyl moiety is a key functional group that can result in major improvements in the potency and selectivity of pharmaceutical agents. We present a radical relay C–H methylation methodology that employs a β-diketiminate copper catalyst capable of methylating unactivated C(sp3)–H bonds. Taking advantage of the bench-stable DABAL-Me3, an amine-stabilized trimethylaluminum reagent, methylation of a range of substrates possessing both activated and unactivated C(sp3)–H bonds proceeds with a minimal amount of overmethylation. Mechanistic studies supported by both experiment and computation suggest the intermediacy of a copper(II) methyl intermediate reactive toward both the loss of the methyl radical as well capture of radicals R•to form R–Me bonds.
DOI: --
发表时间: 1963
期刊:
影响因子: --
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