据报道,由容易获得的2-芳基-3-羟基丙烯酸酯合成5-芳基-4-(芳基乙炔基)嘧啶的高产率方法。这些嘧啶易于在强布朗斯台德酸中环化,并且取决于炔基嘧啶中的取代基和反应混合物的水含量,可生成苯并[ f ]喹唑啉或螺[环己-2,5-二烯-1,5'的衍生物-cyclopenta [ d ]嘧啶] -4-一。在大多数情况下,环化几乎是定量进行的。DFT计算支持由5-芳基-4-(芳基乙炔基)嘧啶中的三键质子化诱导的拟议机理。还描述了所获得的杂环的荧光性质。
First Example of the Intermolecular Palladium-Catalyzed Asymmetric Allylic Alkylation of Hydroxyacrylates: Synthesis of All-Carbon α-Aryl Quaternary Aldehydes
作者:Sharif A. Asad、Joseph Ulicki、Maria Shevyrev、Nazim Uddin、Eduardo Alberch、M. Mahmun Hossain
DOI:10.1002/ejoc.201402911
日期:2014.9
A set of acyclic all-carbonα-arylquaternaryaldehydes was synthesized by intermolecularpalladium-catalyzedasymmetricallylicalkylation (Pd-AAA). Hydroxyacrylates were used as unprecedented nucleophilic counterparts instead of widely used ketone substrates. This produced a very rare all-carbonquaternaryaldehyde. Chiral ligand (R,R)-L3 was found to be optimal in this Pd-AAA reaction and provided
First Example of Intermolecular Palladium-Catalyzed Asymmetric Allylic Alkylation of Hydroxyacrylates: Synthesis of All-Carbon α-Aryl Quaternary Carbonyl Compounds
作者:M. Hossain、Sharif Asad
DOI:10.1055/s-0035-1560727
日期:——
disclosed, the striking similarities would have been noted and the manuscript would not have been accepted for publication. (1) FirstExample of the IntermolecularPalladium-CatalyzedAsymmetricAllylicAlkylation of Hydroxyacrylates: Synthesis of All-Carbonα-ArylQuaternaryAldehydes, S. A. Asad, J. Ulicki, M. Shevyrev, N. Uddin, E. Alberch, M. M. Hossain Eur. J. Org. Chem. 2014, 5695–5699.
Unusual Anion Effects in the Iron‐Catalyzed Formation of 3‐Hydroxyacrylates from Aromatic Aldehydes and Ethyl Diazoacetate
作者:Luis Gonçalo Alves、Georg Dazinger、Luis F. Veiros、Karl Kirchner
DOI:10.1002/ejic.201000240
日期:2010.7
Due to the lability of one of the CO ligands in trans-[Fe(PNP)-(CO) 2 CI] + this compound is an efficient catalyst for the coupling of a series of aromatic aldehydes with ethyl diazoacetate (EDA), which give, in most cases, selectively 3-hydroxyacrylates rather than β-oxo esters. This reaction is strongly dependent on the nature of the counterion. Whereas with BF 4 - the reaction proceeds with conversions
Efficient Synthesis of Bicyclic 2‐Pyridinones and 6‐Amino‐2‐pyridinones by the Regioselective Cycloaddition of Nitro Ketene Aminal with 3‐Hydroxy‐2‐aryl‐acrylate
作者:Si‐Yu Wang、Zhong‐Wei Zhang、Liu Yuan、Yi Jin、Cong‐Hai Zhang、Jun Lin
DOI:10.1002/ejoc.202201268
日期:2023.1.17
An efficient method was developed to construct 2-pyridinones by the cycloaddition of nitro ketene aminal with 3-hydroxy-2-aryl-acrylate. The method uses readily-available starting materials and provided diverse bicyclic 2-pyridinones and multi-substituted 6-amino-2-pyridinones in good to excellent yields.
Acid-catalyzed decomposition of diazocarbonyl compounds triggers a wide range of transformations leading to synthetically useful building blocks with high diversity. In this field, the chemistry of α-diazo-β-hydroxy ester substrates is largely dominated by migration processes. We describe herein a new approach to original mixed monosilyl acetals from O-protected α-diazo-β-hydroxy-β-aryl esters and alcohols