Palladium(0)-Catalyzed Single and Double Isonitrile Insertion: A Facile Synthesis of Benzofurans, Indoles, and Isatins
作者:Gopal Chandru Senadi、Wan-Ping Hu、Siva Senthil Kumar Boominathan、Jeh-Jeng Wang
DOI:10.1002/chem.201405933
日期:2015.1.12
A palladium(0)‐catalyzed cascade process consisting of isonitrileinsertion and α‐Csp3H cross‐coupling can be achieved for the synthesis of benzofurans and indoles. The construction of isatins by a Pd‐catalyzed cascade reaction incorporating double isonitrileinsertion, amination, and hydrolysis has also been achieved. The key features of this work include diverse heterocycle synthesis, phosphine‐ligand‐free
Rhodium-Catalyzed Formal C–O Insertion in Carbene/Alkyne Metathesis Reactions: Synthesis of 3-Substituted 3<i>H</i>-Indol-3-ols
作者:Shikun Jia、Guizhi Dong、Chaoqun Ao、Xianxing Jiang、Wenhao Hu
DOI:10.1021/acs.orglett.9b01492
日期:2019.6.7
An efficient and novel rhodium-catalyzed formal C–O insertion reaction of alkyne-tethered diazo compounds for the synthesis of 3H-indol-3-ols is described. A type of donor/donor rhodium carbene generated in situ via a carbene/alkyne metathesis (CAM) process is the key intermediate and terminates in a unique transformation different from donor/acceptor carbenoids. In addition, 18O-labeling experiments
Assembly of Substituted 1<i>H</i>-Benzimidazoles and 1,3-Dihydrobenzimidazol-2-ones via CuI/<scp>l</scp>-Proline Catalyzed Coupling of Aqueous Ammonia with 2-Iodoacetanilides and 2-Iodophenylcarbamates
作者:Xiaoqiong Diao、Yuji Wang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo9017183
日期:2009.10.16
CuI/l-proline catalyzed coupling of aqueous ammonia with 2-iodoacetanilides and 2-iodophenylcarbamates affords the arylamination products at roomtemperature, which undergo in situ additive cyclization under acidic conditions or heating to give substituted 1H-benzimidazoles and 1,3-dihydrobenzimidazol-2-ones, respectively. A wide range of functional groups including ketone, nitro, iodo, bromo, and
CuI / l-脯氨酸催化氨水与2-碘乙酰苯胺和2-碘苯基氨基甲酸酯的偶联在室温下提供芳基胺化产物,将其在酸性条件下进行原位加成环化或加热以生成取代的1 H-苯并咪唑和1,3-二氢苯并咪唑-2-酮。在这些反应条件下,可以耐受包括酮,硝基,碘,溴和酯在内的各种官能团,从而为这些杂环提供了极大的多样性。
Pd/C Catalyzed Cascade Synthesis of 2‐Arylquinazolinones from 2‐Iodoacetanilides Employing Ammonia and CO Precursors
作者:Shaifali、Pushkar Mehara、Ashish Kumar、Pralay Das
DOI:10.1002/cctc.202100152
日期:2021.5.19
demonstrated for 2-aryl quinazolinones synthesis from 2-iodoacetanilides using ammonium carbamate/ammonium carbonate and oxalic acid under heterogeneous Pd/Ccatalyzed conditions. Herein, we have carried out the reactions employing oxalic acid and ammonium carbamate or ammonium carbonate as two gaseous precursors i. e. CO and NH3 respectively for the synthesis of desired quinazolinones in appreciable
Regiodivergent cascade cyclization/alkoxylation of allenamides <i>via</i> N-protecting group driven rearrangement to access indole and indoline derivatives
作者:Dhananjay Chaudhary、Suman Yadav、Naveen Kumar Maurya、Dharmendra Kumar、Km Ishu、Malleswara Rao Kuram
DOI:10.1039/d2cc03174d
日期:——
tethered allenamides is described, providing regiodivergent indole and indoline derivatives controlled by the N-protecting group. This room temperature reaction provided a functionalizable olefinic moiety with broad substrate scope. Preliminary mechanistic studies support the rearrangement of an indoline-derived intermediate to indoles with the N-acetyl allenamides forming free (NH) indoles.