Synthesis of Polycyclic Compounds by a Cascade Cycloisomerisation/Diels-Alder Reaction
作者:José Barluenga、Jonás Calleja、Abraham Mendoza、Félix Rodríguez、Francisco J. Fañanás
DOI:10.1002/chem.201000515
日期:2010.6.25
Running rings around gold: A new cascade reactioncatalysed by AuCl3 that is based upon an initial cycloisomerisation reaction of enynol or enynamine derivatives, which form 1,3‐butadiene derivatives, followed by a Diels–Alder cycloaddition reaction to give fused or spirocyclic compounds is reported (see scheme).
Synthesis of Spirocyclic Isoindolones Using an Alkynyl <i>aza</i>-Prins/Oxidative <i>halo</i>-Nazarov Cyclization Sequence
作者:Jackson J. Hernandez、Alison J. Frontier
DOI:10.1021/acs.orglett.1c00191
日期:2021.3.5
In this report, we describe an alkynyl halo-aza-Prins cyclization of 3-hydroxyisoindolones to prepare aza-Prins products. These Prins adducts undergo oxidation at the 3-isoindolone position after activation of the amide by triflic anhydride and 2-chloropyridine to form a pentadienyl cation capable of undergoing a halo-Nazarov cyclization. Using this methodology, angular-fused N-heterocyclic small molecules
Intramolecular coupling of conjugated enynes with cyclopropylcarbene–chromium complexes; a complex reaction pathway
作者:Julius J Matasi、Jingbo Yan、James W Herndon
DOI:10.1016/s0020-1693(99)00319-9
日期:1999.12
The intramolecular coupling of conjugated enynes with cyclopropylcarbene complexes has been investigated. The desired products of the reaction, alpha-alkenylcyclopentenones, were minor products of the reaction. Competing reaction processes included double bond reduction and allylic C-H activation. Intramolecular coupling of selenium-containing alkynes and cyclopropylcarbene complexes followed by oxidation/elimination provided a more efficient route to a-alkenylcyclopentenones. (C) 1999 Elsevier Science S.A. All rights reserved.
Diastereoselective Construction of Densely Functionalized 1‐Halocyclopentenes Using an Alkynyl Halo‐Prins/Halo‐Nazarov Cyclization Strategy
作者:Georgios Alachouzos、Alison J. Frontier
DOI:10.1002/anie.201709482
日期:2017.11.20
developed. In the first step, a multicomponent alkynyl halo‐Prins reaction joins an enyne, a carbonyl derivative, and either a chloride, bromide, or iodide to produce a cyclic ether intermediate. In the subsequent step, the intermediate is ionized to generate a halopentadienyl cation, which undergoes an interrupted halo‐Nazarovcyclization. The products contain three new contiguous stereogenic centers