Formaldehyd-O-oxid und Colchicine: ein eleganter Zugang zu Allocolchicinen
摘要:
Tropone is a structural unit of numerous natural products i.e. imerubrine, harringtonolide and colchicine (2). It is of interest to study the selectivity of formaldehyde-O-oxide (1) with respect to these polyfunctional tropone derivatives. We report about the reactions of 1 with colchicine (2) and the colchicine derivatives 5, 8, 11, 14, 17, 20 under ozone free conditions. The fragmentation of the spiroozonides 3, 6, 9, 12, 15, 18, 21 via the activated complexes 3a, 6a, 9a, 12a, 15a, 18a, 21a opens up an elegant route to the allocolchicines 4, 7, 10, 13, 16, 19.
Photoinduced Cross-Coupling of Aryl Iodides with Alkenes
作者:Yuliang Liu、Haoyu Li、Shunsuke Chiba
DOI:10.1021/acs.orglett.0c03935
日期:2021.1.15
A protocol for photoinduced cross-coupling of aryliodides having polar π-functional groups or elongated π-conjugation with alkenes has been developed. The radical cascade mechanism involving generation of aryl radicals via C–I bond homolysis of photoexcited aryliodides and their subsequent addition to alkenes is proposed. The method enables iodide-selective cross-coupling over other halogen leaving
Indolyne Experimental and Computational Studies: Synthetic Applications and Origins of Selectivities of Nucleophilic Additions
作者:G-Yoon J. Im、Sarah M. Bronner、Adam E. Goetz、Robert S. Paton、Paul H.-Y. Cheong、K. N. Houk、Neil K. Garg
DOI:10.1021/ja1086485
日期:2010.12.22
conditions, trapped by a variety of nucleophilic reagents, and used to access a number of novel substituted indoles. Nucleophilicaddition reactions to indolynes proceed with varying degrees of regioselectivity; distortion energies control regioselectivity and provide a simple model to predict the regioselectivity in the nucleophilicadditions to indolynes and other unsymmetrical arynes. This model
[EN] SULFONIMIDAMIDE COMPOUNDS AS NLRP3 MODULATORS<br/>[FR] COMPOSÉS DE SULFONIMIDAMIDE EN TANT QUE MODULATEURS DE NLRP3
申请人:GENENTECH INC
公开号:WO2021150574A1
公开(公告)日:2021-07-29
Described herein are compounds of Formula (I), Formula (I-A), and Formula (I-B), solvates thereof, tautomers thereof, and pharmaceutically acceptable salts of the foregoing, Further described herein are methods of inhibiting NLRP3 using said compounds, and methods of and compositions useful in treating NLRP3-dependent disorders.
3-Hydroxy-2-(trialkylsilyl)phenyl Triflate: A Benzyne Precursor Triggered via 1,3-C-sp<sup>2</sup>-to-O Silyl Migration
作者:Yong-Ju Kwon、Young-Kyo Jeon、Ha-Bin Sim、In-Young Oh、Inji Shin、Won-Suk Kim
DOI:10.1021/acs.orglett.7b03160
日期:2017.11.17
3-Hydroxy-2-(trialkylsilyl)phenyl triflates are presented as new versatile hydroxyaryne precursors. These are base-activated aryne precursors induced via a C-sp2-to-O 1,3-Brook rearrangement. The reaction of various arynophiles and 3-trialkylsiloxybenzyne generated from 3-hydroxy-2-(trialkylsilyl)phenyl triflateefficiently afforded highly regioselective phenol derivatives. Furthermore, through crossover
Monocyclic 1, 2, 3-triazines reacted with electron rich dienophiles to give pyridines and pyridazines. 4, 6-Disubstituted 1, 2, 3-triazine was denitrogenated to the azete intermediate, which afforded isomeric pyridines. 2, 5-Dihydrotriazines were oxidized by m-chloroperbenzoic acid to give 1, 2, 3-triazoles. Ring transformations of other triazine derivatives are also reported.