The Ketene-Surrogate Coupling: Catalytic Conversion of Aryl Iodides into Aryl Ketenes through Ynol Ethers
作者:Wenhan Zhang、Joseph M. Ready
DOI:10.1002/anie.201405036
日期:2014.8.18
tert‐Butoxyacetylene is shown to undergo Sonogashira coupling with aryliodides to yield aryl‐substituted tert‐butyl ynol ethers. These intermediates participate in a [1,5]‐hydride shift, which results in the extrusion of isobutylene and the generation of aryl ketenes. The ketenes are trapped in situ with multiple nucleophiles or undergo electrocyclic ring closure to yield hydroxynaphthalenes and quinolines
Synthesis of Alkyl-Ynol-Ethers by “Anti-Michael Addition” of Metal Alkoxides to β-Substituted Alkynylsulfones
作者:Leyre Marzo、Alejandro Parra、María Frías、José Alemán、José Luis García Ruano
DOI:10.1002/ejoc.201300395
日期:2013.7
alkoxides with β-substituted 2-(p-tolylsulfonyl)acetylenes, involving an anti-Michael addition reaction followed by the in situ elimination of the sulfonyl moiety, provides a direct method for the synthesis of alkyl alkynyl ethers bearing aryl or TIPS groups joined to the triple bond. Arylalkynyl ethers derived from primary alkoxides are in situ hydrolyzed into arylacetic esters.
Transition-Metal-Free Synthesis of Aryl-Substituted<i>tert</i>-Butyl Ynol Ethers through Addition/Elimination Substitution at an sp Centre
作者:Vincent J. Gray、Ben Slater、Jonathan D. Wilden
DOI:10.1002/chem.201203015
日期:2012.12.3
sulfonamide leads to displacement of the sulfonamide at the sp centre and isolation of the ynol ether in good yield in a single operation (see scheme). The mechanistic pathway has been probed by the use of coordinating additives, 13C‐labelling experiments and ab initio calculations, which indicated that an addition/elimination mechanism is in operation.
Construction of 1-Naphthols via Benzannulation Based on the Reaction of Aryl <i>tert</i>-Butyl Ynol Ethers with Ynamides or Ynol Ethers
作者:Yihui Bai、Jing Yin、Zhicheng Liu、Gangguo Zhu
DOI:10.1021/acs.joc.5b01858
日期:2015.10.16
A new version of benzannulation featuring the use of aromatic tert-butyl ynol ethers as the convenient precursors for arylketenes has been developed. Both ynamides and ynol ethers undergo this reaction smoothly, giving 3-amino and 3-alkoxy 1-naphthols in good to excellent yields under the heated reaction conditions. The high efficiency, excellent regioselectivity, good functional group compatibility