已经提出了一种直接闭环策略,该策略涉及用于合成苯并 [ b ] 氮卓类化合物的o -炔基苯胺衍生物的不太容易进行 7-内切-挖掘碳环化。由于氮的高亲核性,在 o -炔基苯胺衍生物中的微不足道的 5-内切环化已被克服,通过在金催化下使用它们的插烯酰胺来获得广泛的苯并[ b ]]azepines 以原子经济的方式具有出色的官能团相容性。氘加扰实验和 DFT 研究支持一种机制,该机制涉及通过关键的环丙基金卡宾中间体稳定最初形成的七元乙烯基金中间体的构象变化及其随后由抗衡阴离子介导的原脱氧反应。
A metal-free and two-phase protocol for the Meyer-Schuster isomerization of propargyl alcohols to the corresponding α,β-unsaturatedcarbonylcompounds has been achieved in the presence of stoichiometric phosphorous acid aqueous solution, which produces the desired products in high yields with excellent stereoselectivity. Compared with the traditional methods, the procedure features broad scope of the
It has been shown that some chalcones are able to inhibit tubulin polymerization, giving cytotoxicity and destruction
of tumoral vasculature. A library of 180 novel chalcone analogs has been synthesized via click chemistry and
screened for their cytotoxicity and tubulin assembly inhibition. 10 out 180 click chalcones displayed low micromolar cytotoxicity
but only compound Nf depicted antitubulin activity. While Nf displayed only micromolar potency this result
shows click-chalcones may be anti-tubulin agents and validate this strategy to search for novel active chemical entities.
Covalent Adaptable Networks with Tunable Exchange Rates Based on Reversible Thiol–yne Cross‐Linking
作者:Niels Van Herck、Diederick Maes、Kamil Unal、Marc Guerre、Johan M. Winne、Filip E. Du Prez
DOI:10.1002/anie.201912902
日期:2020.2.24
adaptable networks (CANs) relies on the ability to trigger the rearrangement of bonds within a polymer network. Simple activated alkynes are now used as versatile reversible cross-linkers for thiols. The click-like thiol-yne cross-linking reaction readily enables network synthesis from polythiols through a double Michael addition with a reversible and tunable second addition step. The resulting thioacetal
Synthesis, Structure and Emission Properties of Spirocyclic Benzofuranones and Dihydroindolones: A Domino Insertion–Coupling–Isomerization– Diels–Alder Approach to Rigid Fluorophores
作者:Daniel M. D'Souza、Alexander Kiel、Dirk-Peter Herten、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/chem.200700759
日期:2008.1.7
far thermodynamically and kinetically favored over a possible Claisenrearrangement. Compounds of this new class of spirocyclic compounds possess large Stokes shifts and fluoresce intensively with blue over green to orange colors. As a consequence of the spirocyclic rigidity fluorescence lifetimes and quantum yields are rather high in some cases.
4-and 5-alkynyloxindoles and 4-and 5-alkenyloxindoles
申请人:Hoffmann-La Roche Inc.
公开号:US06313310B1
公开(公告)日:2001-11-06
Disclosed are 4- and 5-alkynyloxindoles as well as 4- and 5-alkenyloxindoles that inhibit or modulate protein kinases, in particular JNK protein kinases. The compounds of the invention and their pharmaceutically acceptable salts, and prodrugs of said compounds, are useful as anti-inflammatory agents, particularly useful in the treatment of rheumatoid arthritis. Also disclosed are pharmaceutical compositions containing the foregoing compounds, methods for the treatment and/or control of inflammation, particularly in the treatment or control of rheumatoid arthritis using these compounds, as well as intermediates useful in the preparation of compounds of the invention.