Catalyst-Controlled C–H Functionalization of Adamantanes Using Selective H-Atom Transfer
作者:Hai-Bin Yang、Abigail Feceu、David B. C. Martin
DOI:10.1021/acscatal.9b01394
日期:2019.6.7
been developed using photoredox and H atom transfer catalysis. This C–H alkylation reaction has excellent chemoselectivity for the strong 3° C–H bonds of adamantanes in polyfunctional molecules. In substrate competition reactions, a reversal in selectivity is observed for the new H-atom transfer catalyst reported here in comparison to five known photochemical systems. Derivatization of a broad scope
Hydrogen Atom Transfer Reactions via Photoredox Catalyzed Chlorine Atom Generation
作者:Samantha Rohe、Avery O. Morris、Terry McCallum、Louis Barriault
DOI:10.1002/anie.201810187
日期:2018.11.26
waste‐limiting, and atom‐economical. The catalytic generation of chlorineatoms from chloride ions is one of the most challenging redox processes, where the requirement of harsh and oxidizing reaction conditions renders it seldom utilized in synthetic applications. We report the mild, controlled, and catalytic generation of chlorineatoms as a new opportunity for access to a wide variety of hydrogen atom transfer
Regioselective Radical Addition of Adamantanes to Dimethyl Maleate
作者:Koushi Fukunishi、Iwao Tabushi
DOI:10.1055/s-1988-27723
日期:——
One-to-one adducts of adamantanes with dimethyl maleate, maleic anhydride or fumaronitrile are obtained in the presence of a radical initiator. These free radical additions occur regioselectively at the bridgehead position.
Alkyl Radical Generation via C–C Bond Cleavage in 2-Substituted Oxazolidines
作者:Adrián Luguera Ruiz、Marta La Mantia、Daniele Merli、Stefano Protti、Maurizio Fagnoni
DOI:10.1021/acscatal.2c03768
日期:2022.10.7
corresponding aldehydes) have been herein employed for the successful release of tertiary, α-oxy, and α-amido radicals under photo-organo redox catalysis. The reaction relies on the unprecedented C–Ccleavage occurring from the radical cation of these heterocyclic derivatives. Such a protocol is applied to the visible-light-driven conjugate radical addition onto Michael acceptors and vinyl (hetero)arenes
迫切需要开发在温和的光催化条件下被激活的不带电自由基前体。2-取代-1,3-恶唑烷(E ox < 1.3 V vs SCE,由相应的醛顺利制备)已被用于在光有机氧化还原下成功释放叔、α-氧基和 α-酰胺自由基催化。该反应依赖于这些杂环衍生物的自由基阳离子发生的前所未有的 C-C 裂解。这种协议适用于在温和的无金属条件下将可见光驱动的共轭自由基加成到迈克尔受体和乙烯基(杂)芳烃上。
Photoinduced Halogen-Atom Transfer by <i>N</i>-Heterocyclic Carbene-Ligated Boryl Radicals for C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bond Formation
作者:Ting Wan、Luca Capaldo、Davide Ravelli、Walter Vitullo、Felix J. de Zwart、Bas de Bruin、Timothy Noël
DOI:10.1021/jacs.2c10444
日期:2023.1.18
study on the use of N-heterocyclic carbene (NHC)-ligated borylradicals to enable C(sp3)–C(sp3) bond formation under visible-light irradiation via Halogen-Atom Transfer (XAT). The methodology relies on the use of an acridinium dye to generate the boron-centered radicals from the corresponding NHC-ligated boranes via single-electron transfer (SET) and deprotonation. These borylradicals subsequently