Phosphine-Catalyzed β′-Umpolung Addition of Nucleophiles to Activated α-Alkyl Allenes
摘要:
Highly function alized alkenes can be prepared through phosphine-catalyzed beta'-umpolung additions of nucleophiles (carbon-, oxygen-, nitrogen-, and sulfur-centered) to activated alpha-disubstituted allenes, providing many potentially useful synthetic intermediates in good to excellent yields, often with high levels of stereoselectivity for the product olefin geometry. Various substitution patterns around the allene are compatible with the process, showcasing the synthetic utility of allenes under the conditions of nucleophilic phosphine catalysis.
Coumarins by Direct Annulation: β‐Borylacrylates as Ambiphilic C
<sub>3</sub>
‐Synthons
作者:Max Wienhold、John J. Molloy、Constantin G. Daniliuc、Ryan Gilmour
DOI:10.1002/anie.202012099
日期:2021.1.11
2‐halo‐phenol derivatives to generate structurally and electronically diverse coumarins. Key to this [3+3] disconnection is the BPin unit which serves a dual purpose as both a traceless linker for C(sp2)–C(sp2) coupling, and as a chromophore extension to enable inversion of the alkene geometry via selective energy transfer catalysis. Mild isomerisation is a pre‐condition to access 3‐substituted coumarins
[EN] NEW ANTIBACTERIAL COMPOUNDS<br/>[FR] NOUVEAUX COMPOSÉS ANTIBACTÉRIENS
申请人:ACRAF
公开号:WO2016096631A1
公开(公告)日:2016-06-23
The present invention relates to novel antibacterial compounds, pharmaceutical compositions containing them and their use as antimicrobials.
本发明涉及新型的抗菌化合物、含有它们的药物组合物以及它们作为抗菌剂的应用。
Synthesis of Coumarins, 4-Hydroxycoumarins, and 4-Hydroxyquinolinones by Tellurium-Triggered Cyclizations<sup>1</sup>
作者:Donald C. Dittmer、Qun Li、Dimitry V. Avilov
DOI:10.1021/jo050070u
日期:2005.6.1
can be conveniently prepared by treatment of α-halocarboxylic acid esters of salicylaldehyde, o-hydroxyacetophenone, methylsalicylate, and methyl N-methyl- or N-phenylanthranilates with sodium or lithium telluride. Phenylketene formation competes with cyclization of the α-chlorophenylacetate ester of methylsalicylate as demonstrated by a trapping experiment with benzylamine. Elemental tellurium
Einfache Synthese von 3-Methyl-5,6-dihydro-2H-pyran-2-onen und 3-Methylcumarinen unter milden Bedingungen
作者:Gioacchino Falsone、Bernd Spur、H. Peter Wingen
DOI:10.1002/ardp.19833160907
日期:——
Es wird die Synthese der 3‐Methyl‐5,6‐dihydro‐2H‐pyran‐2‐one 3,5 und der 3‐Methylcumarine 7a—e aus den β‐Hydroxy‐oxo‐Verbindungen 1, 4, 6a—c und der Phosphonopropionsäure 2 unter Wittig‐Horner Bedingungen beschrieben.
[EN] BROMODOMAIN LIGANDS CAPABLE OF DIMERIZING IN AN AQUEOUS SOLUTION<br/>[FR] LIGANDS DE BROMODOMAINE POUVANT SE DIMÉRISER DANS UNE SOLUTION AQUEUSE
申请人:COFERON INC
公开号:WO2015081280A1
公开(公告)日:2015-06-04
Described herein are monomers capable of forming a biologically useful multimer when in contact with one, two, three or more other monomers in an aqueous media. In one aspect, such monomers may be capable of binding to another monomer in an aqueous media (e.g. in vivo) to form a multimer (e.g. a dimer). Contemplated monomers may include a ligand moiety, a linker element, and a connector element that joins the ligand moiety and the linker element. In an aqueous media, such contemplated monomers may join together via each linker element and may thus be capable of modulating one or more biomolecules substantially simultaneously, e.g., modulate two or more binding domains on a protein or on different proteins.