Development of a Cross‐Conjugated Vinylogous [4+2] Anionic Annulation and Application to the Total Synthesis of Natural Antibiotic (±)‐ABX
作者:Jing‐Kai Huang、Kak‐Shan Shia
DOI:10.1002/anie.201914657
日期:2020.4.16
vinylogous [4+2] anionic annulation has been newly developed, the cascade process of which has a high preference for regiochemical control and chemoselectivity, giving rise to exclusively Michael-type adducts in moderate to high yields (up to 94 %, 35 examples). By making use of this approach as a key operation, the first total synthesis of natural antibiotic ABX, in racemic form, has been successfully
Synthesis of Benzo[<i>c</i>][2,7]naphthyridinones and Benzo[<i>c</i>][2,6]naphthyridinones via Ruthenium-Catalyzed [2+2+2] Cycloaddition between 1,7-Diynes and Cyanamides
A convenient method for the ruthenium-catalyzed synthesis of benzo[c]naphthyridinone derivatives is reported. The [2+2+2] cycloaddition from various mono- and disubstituted 1,7-diynes and cyanamides provided benzo[c][2,7]naphthyridinones as major products and benzo[c][2,6]naphthyridinones as minor ones in yields of ≤79% and regioselectivities of ≤99:1. This method is amenable to internal and terminal
报道了一种简便的钌催化合成苯并[ c ]萘啶酮衍生物的方法。各种单取代和双取代的 1,7-二炔和单氰胺的 [2+2+2] 环加成反应提供苯并[ c ][2,7]萘啶酮作为主要产物,苯并[ c ][2,6]萘啶酮作为次要产物产率≤79%,区域选择性≤99:1。该方法适用于内部和末端二炔以及许多具有不同官能团耐受性的氰胺。
Preparation of Triazoloindoles via Tandem Copper Catalysis and Their Utility as α-Imino Rhodium Carbene Precursors
作者:Yanpeng Xing、Guorong Sheng、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/ol5002347
日期:2014.2.21
3-Sulfonyl[1,2,3]triazolo[4,5-b]indoles were efficiently prepared via a tandem catalysis process involving intramolecular ligand stabilized CuAAC and Cu-catalyzed C-N coupling. The obtained 3-sulfonyl[1,2,3]triazolo[4,5-b]indoles could be utilized as a-imino rhodium carbene precursors for the construction of a range of valuable indole molecules including pyrrolo[2,3-b] indoles, spirocyclopropyl iminoindoles, 2,3-dihydropyrrolo[2,3-b]indoles, 3,3'-biindoles, and 2,3'-biindoles.
Iodine-Mediated C–H Functionalization of sp, sp<sup>2</sup>, and sp<sup>3</sup> Carbon: A Unified Multisubstrate Domino Approach for Isatin Synthesis
Molecular iodine-promoted efficient construction of isatins from 2'-aminophenylacetylenes, 2'-aminostyrenes, and 2'-amino-,beta-ketoesters is developed via oxidative amidation of sp, sp(2), and sp(3) C-H bonds. The reaction involves consecutive iodination, Kornblum oxidation, and intramolecular amidation in a single reactor. The present method meets all of the atom and redox economy principles.