Mild and selective deprotection of carbamates with Bu4NF
摘要:
A new mild method allowing the removal of carbamates using TBAF in THF is reported. Reactions were performed on indole, indoline, N-methyl aniline, aniline and tryptamine derivatives. The observed selectivity according to the carbamates or the substrates is discussed. A mechanism is postulated. (C) 2004 Published by Elsevier Ltd.
Copper-Catalyzed Decarboxylative Radical Silylation of Redox-Active Aliphatic Carboxylic Acid Derivatives
作者:Weichao Xue、Martin Oestreich
DOI:10.1002/anie.201706611
日期:2017.9.11
A decarboxylative silylation of aliphatic N‐hydroxyphthalimide (NHPI) esters using Si−B reagents as silicon pronucleophiles is reported. This C(sp3)−Si cross‐coupling is catalyzed by copper(I) and follows a radical mechanism, even with exclusion of light. Both primary and secondary alkyl groups couple effectively, whereas tertiary alkyl groups are probably too sterically hindered. The functional‐group
Visible‐light‐induced heterogeneous photocatalysis for decarboxylative alkynylation has been performed. The using of cheap, metal‐free and recyclable graphitic carbonnitride (g‐C3N4) as the photoredox catalyst in the process enables the facile transformation of a variety of carboxylic acids into structurally diverse alkyne‐containing molecular architectures under mild and environmentally‐benign conditions
可见光诱导的非均相光催化脱羧炔基反应。使用便宜,无金属且可回收的石墨氮化碳(g ‐ C 3 N 4)作为该过程中的光氧化还原催化剂,可以在温和和环境友好的条件下将多种羧酸轻松转化为结构多样的含炔分子结构。明显地,反应系统的非均质性质允许催化剂在多次运行中的回收和再利用而不损失反应性。光催化反应也可以以连续流动的方式进行并按比例放大至克级。此外,该策略在未活化烯烃的1,2氨基炔基化中的应用进一步凸显了该策略的制备能力。
Enamides Accessed from Aminothioesters via a Pd(0)-Catalyzed Decarbonylative/β-Hydride Elimination Sequence
作者:Geanna K. Min、Dácil Hernández、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/ol101620r
日期:2010.11.5
A facile synthesis of various enamides from aminothioesters via a palladium(0)-catalyzed decarbonylation/β-hydride elimination is reported. This protocol was applied to mercaptopyridyl C-terminal modified peptides for the generation of enamides without epimerization at stereogenic centers.
Synthesis of Homoallylic Amines via the Palladium-Catalyzed Decarboxylative Coupling of Amino Acid Derivatives
作者:Erin C. Burger、Jon A. Tunge
DOI:10.1021/ja063115x
日期:2006.8.1
Protected homoallylic amines are synthesized by the decarboxylative coupling of alpha-amino acid derivatives. The catalytic C-C bond-forming reaction relies on the bioinspired decarboxylative metalation of alpha-amino acids to produce alpha-amino anion equivalents. The alpha-amino anion equivalents are intercepted by pi-allyl palladium electrophiles to produce substituted homoallylic amines.
受保护的高烯丙基胺是通过α-氨基酸衍生物的脱羧偶联合成的。催化 CC 键形成反应依赖于生物启发的 α-氨基酸脱羧金属化,以产生 α-氨基阴离子等价物。α-氨基阴离子等价物被π-烯丙基钯亲电试剂截获以产生取代的高烯丙基胺。
Visible-Light-Induced Cascade Difunctionalization of Indoles Enabled by the Synergy of Photoredox and Photoexcited Ketones: Direct Access to Alkylated Pyrrolophenanthridones
作者:Su Chen、Serena Pillitteri、Eduard Fron、Luc Van Meervelt、Erik V. Van der Eycken、Upendra K. Sharma
DOI:10.1021/acs.orglett.2c03697
日期:2022.12.30
methodology to construct polycyclic pyrrolophenanthridones with an (amino)alkyl side chain that involves visible-light-induced decarboxylative radical addition for the intermolecular dearomatization of indoles and subsequent photoinduced C(sp2)–X bond activation via photoexcited ketones for an intramolecular cyclization cascade. Carboxylic acids serve both as a radical source toward indole dearomatization