Synthesis of bulky 1,2-dialkoxy- and 1,2,3-trialkoxy-arenes
摘要:
A large series of bulky 1,2-dialkoxy- and 1,2,3-trialkoxy-benzenes was efficiently prepared via Williamson etherification. Preparation of their contiguous bromine-containing derivatives was also achieved. (C) 2011 Elsevier Ltd. All rights reserved.
Parallel Solution-Phase Synthesis and General Biological Activity of a Uridine Antibiotic Analog Library
作者:Omar Moukha-chafiq、Robert C. Reynolds
DOI:10.1021/co4001452
日期:2014.5.12
coupling of the amino terminus of d-phenylalanine methylester to the free 5′-carboxylic acid moiety of 33 followed by sodium hydroxide treatment led to carboxylic acid analog 77. Hydrolysis of this material gave analog 78. The intermediate 77 served as the precursor for the preparation of novel dipeptidyl uridine analogs 79–99 through peptide coupling reactions to diverse amine reactants. None of the described
transition-metal-free synthesis of spiroisoxazolines is outlined. This protocol provides, for the first time, a direct access to spiroisoxazolines from aryl (thio)ethers or (thio)phenols in one synthetic step via an oximation/dearomatization cascade. In this reaction, sodium nitrite plays dual roles: as a hydroxylamine source and also a precatalyst to promote the aerobic dearomatization. This methodology features
[EN] ANTIPROLIFERATIVE BENZO [B] AZEPIN- 2 - ONES<br/>[FR] BENZO[B]AZÉPIN-2-ONES INHIBITRICES DE LA PROLIFÉRATION
申请人:HOFFMANN LA ROCHE
公开号:WO2014009495A1
公开(公告)日:2014-01-16
Disclosed are compounds of Formula (I) or pharmaceutically acceptable salts thereof, wherein W, X, Y, Z, R1, R2, R3 and R4 are described in this application, and methods of using said compounds in the treatment of cancer.
chelating benzylideneligand offers the unique ability to control the initiation of Hoveyda–Grubbsmetathesiscatalysts. Apart from steric and electronic effects acting on the step involving opening of the chelate ring, changes related to the following ligand-exchange process may also play a critical role. Our mechanistic model reveals that ligands substituted at the 6-position of the benzylidene ring enter
螯合亚苄基配体的结构提供了控制 Hoveyda-Grubbs 复分解催化剂引发的独特能力。除了空间和电子效应作用于螯合环打开的步骤之外,与随后的配体交换过程相关的变化也可能起到关键作用。我们的机理模型表明,在亚苄基环的 6 位取代的配体以非最佳螯合构象进入复分解循环,因此钌中心的配位数暂时增加到 6(缔合机制)。实际上,催化剂的合成和引发变得困难,配体交换过程的能垒受配位 OR 基团的结构控制。而且,
Is the Hoveyda-Grubbs Complex a Vinylogous Fischer-Type Carbene? Aromaticity-Controlled Activity of Ruthenium Metathesis Catalysts
Three naphthalene-based analogues (4 a-c) of the Hoveyda-Grubbsmetathesiscatalyst exhibited immense differences in reactivity. Systematic structural and spectroscopic studies revealed that the ruthenafurane ring present in all 2-isopropoxyarylidene chelates possesses some aromatic character, which inhibits catalystactivity. This aromatic stabilization within the chelate ring may be controlled by