Organic iodides undergo chemospecific alkynylation with triisopropylsilylacetylenic triflone under photochemical irradiation. Examples include primary, secondary, and tertiary iodides. The reaction is compatible with many functional groups, such as alcohol, ester, amide, thiazole, and a potential p-elimination substrate. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Organocuprate Cross–Coupling Reactions with Alkyl Fluorides
作者:Bryan C. Figula、D. Lucas Kane、Kaluvu Balaraman、Christian Wolf
DOI:10.1021/acs.orglett.2c03775
日期:2022.12.2
Cross-coupling of alkylfluorides and organocuprates is accomplished via aluminum halide mediated C–F bond activation and subsequent Csp2–Csp3 and Csp3–Csp3 bond formation. Relatively mild conditions allow for smooth activation of notoriously challenging primary and secondary alkylfluorides while competing alkyl chain rearrangement, HF elimination, and homocoupling reactions are effectively controlled
烷基氟化物和有机铜酸盐的交叉偶联是通过卤化铝介导的 C-F 键活化以及随后的 C sp2 -C sp3和 C sp3 -C sp3键形成来完成的。相对温和的条件允许顺利激活众所周知具有挑战性的伯烷基氟和仲烷基氟,同时有效控制竞争性烷基链重排、HF 消除和自偶联反应。实用性和官能团耐受性通过 23 个实例和多种偶联产物得到证明,产率高达 88%。
Copper‐Catalyzed Difluoromethylation of Alkyl Iodides Enabled by Aryl Radical Activation of Carbon–Iodine Bonds
作者:Aijie Cai、Wenhao Yan、Chao Wang、Wei Liu
DOI:10.1002/anie.202111993
日期:2021.12.20
An aryl radical activation strategy has been developed that can engage unactivated alkyliodides in copper-catalyzed Negishi-type cross-coupling reactions. The strategy is based on the largely overlooked yet highly efficient reactivity of aryl radicals to abstract iodine atoms from alkyliodides.
Organic iodides undergo chemospecific alkynylation with triisopropylsilylacetylenic triflone under photochemical irradiation. Examples include primary, secondary, and tertiary iodides. The reaction is compatible with many functional groups, such as alcohol, ester, amide, thiazole, and a potential p-elimination substrate. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.