Palladium-catalyzed enolate arylation as a key C–C bond-forming reaction for the synthesis of isoquinolines
作者:Ben S. Pilgrim、Alice E. Gatland、Carlos H. A. Esteves、Charlie T. McTernan、Geraint R. Jones、Matthew R. Tatton、Panayiotis A. Procopiou、Timothy J. Donohoe
DOI:10.1039/c5ob02320c
日期:——
those that give rise to the traditionally difficult to access electron-deficient isoquinoline skeletons. These two synthetic operations can be combined to give a three-component, one-pot isoquinoline synthesis. Alternatively, cyclization of the intermediates with hydroxylamine hydrochloride engenders direct access to isoquinoline N-oxides; and cyclization with methylamine, gives isoquinolinium salts. Significant
A Mild and Regioselective Synthesis of α‐Fluoroketones
<i>via</i>
Gold and Selectfluor Partnership
作者:Xi Chen、Sophie Martini、Véronique Michelet
DOI:10.1002/adsc.201900268
日期:2019.8.5
from aldehyde‐yne and alkynylaryl ketone derivatives. Several functionalized and synthetically highly valuable α‐fluoroketones (21 compounds, up to 92%) were isolated in good to excellent yields via a remarkable regioselective oxyfluorination reaction in EtOH/H2O at room temperature. We have shed some light on parts of the mechanism by reacting diphenylacetylene and aldehyde‐yne with or without Selectfluor
通过从醛炔和炔基芳基酮衍生物开始的金与Selectfluor之间的卓有成效的结合,已开发出高效,温和且快速的α-氟代酮合成方法。通过在室温下在EtOH / H 2 O中进行显着的区域选择性氧氟化反应,可以分离出数种功能良好且合成价值很高的α-氟代酮(21种化合物,含量高达92%)。通过使二苯乙炔和乙炔与或不与Selectfluor进行反应,我们对机理的某些部分有所了解。该反应最有可能通过以下途径发生依次进行金催化的区域选择性水合,然后进行α-氟化反应,但是醛基的存在对于炔烃功能的反应性至关重要。氟酮被有效地转化为具有高度药用价值的4-氟异喹啉(9种化合物,占82%至95%)。
Efficient Pathway for the Preparation of Aryl(isoquinoline)iodonium(III) Salts and Synthesis of Radiofluorinated Isoquinolines
作者:Zheliang Yuan、Ran Cheng、Pinhong Chen、Guosheng Liu、Steven H. Liang
DOI:10.1002/anie.201606381
日期:2016.9.19
to assemble aryl(isoquinoline)iodonium salts in 40–94 % yields from mesoionic carbene silver complex and Aryl‐I‐Py2(OTf)2. The method is general, practical, and compatible with well‐functionalized molecules as well as useful for the preparation of a wide range of 18F‐labeled isoquinolines resulting in up to 92 % radiochemical conversion. As proof of concept, a fluorinated isoquinoline alkaloid, 18F‐aspergillitine
Ag(I)-Catalyzed Aminofluorination of Alkynes: Efficient Synthesis of 4-Fluoroisoquinolines and 4-Fluoropyrrolo[α]isoquinolines
作者:Tao Xu、Guosheng Liu
DOI:10.1021/ol3026507
日期:2012.11.2
A silver-catalyzedintramolecular oxidative aminofluorination of alkynes has been developed by using NFSI as a fluorinating reagent. This reaction represents an efficient method for the synthesis of various 4-fluoroisoquinolines and 4-fluoropyrrolo[α]isoquinolines.
Modular Isoquinoline Synthesis Using Catalytic Enolate Arylation and <i>in Situ</i> Functionalization
作者:Ben S. Pilgrim、Alice E. Gatland、Charlie T. McTernan、Panayiotis A. Procopiou、Timothy J. Donohoe
DOI:10.1021/ol4030309
日期:2013.12.20
bromide, an electrophile, and ammonium chloride were combined in a four-component, three-step, and one-pot coupling procedure to furnish substituted isoquinolines in overall yields of up to 80%. This protocol utilizes the palladium catalyzed α-arylation reaction of an enolate, followed by in situtrapping with an electrophile, and aromatization with ammonium chloride. tert-Butyl cyanoacetate participated