Bioorthogonal Retro-Cope Elimination Reaction of <i>N</i>,<i>N</i>-Dialkylhydroxylamines and Strained Alkynes
作者:Dahye Kang、Justin Kim
DOI:10.1021/jacs.1c00885
日期:2021.4.21
A bioorthogonalreaction between N,N-dialkylhydroxylamines and cyclooctynes is described. This reaction features a highly regioselective transformation between small, easily functionalizable reaction components with second-order rate constants reaching 84 M–1 s–1. The reaction is orthogonal to the inverse-electron demand Diels–Alder reactions between tetrazine and strained alkenes, and its components
描述了N,N-二烷基羟胺和环辛炔之间的生物正交反应。该反应的特点是在小的、易于官能化的反应组分之间进行高度区域选择性转化,二级速率常数达到 84 M –1 s –1。该反应与四嗪和应变烯烃之间的反电子需求 Diels-Alder 反应正交,其组分在细胞裂解物中表现出极好的稳定性和化学选择性。这种逆向 Cope 消除反应在多产的环加成反应类别之外为生物正交反应纲要引入了一个新成员。
An efficient α-hydroxylation of carbonyls using the HOF•CH3CN complex
作者:Sharon Dayan、Yifat Bareket、Shlomo Rozen
DOI:10.1016/s0040-4020(98)01173-9
日期:1999.3
The complexHOF•CH3CN, made directly from fluorine and aqueous acetonitrile, was used for α-hydroxylation of various ketones, esters and acids via their trimethyl silyl enol ethers. The reaction is usually complete in a few minutes at room temperature or below and has high yields.
The ring contraction of cyclic trimethylsilyl enol ethers with arenesulfonyl azides. Ring expansion and ring contraction reactions by means of diazonium betaines. III [1]. Preliminary communication
作者:Ronald A. Wohl
DOI:10.1002/hlca.19730560547
日期:1973.7.18
No abstract is available for this article.
本文没有摘要。
Determination of the Nucleophilicities of Silyl and Alkyl Enol Ethers
rate-determining C−C bond formation. The nucleophilic reactivities span over a range of 108 from the vinylethers 1a,x as the least reactivecompounds (comparable to allylsilanes) to the highly nucleophilic silyl ketene acetal 1u (comparable to enamines). Linear free enthalpy relationships are used to compare the reactivities of these compounds with those of other aliphatic and aromatic π-nucleophiles.
Boron Trifluoride-Mediated Cycloaddition of 3-Bromotetrazine and Silyl Enol Ethers: Synthesis of 3-Bromo-pyridazines
作者:Simon D. Schnell、Jorge A. González、Jan Sklyaruk、Anthony Linden、Karl Gademann
DOI:10.1021/acs.joc.1c01384
日期:2021.9.3
regiocontrol remains difficult. We achieved the Lewis acid-mediated inverse electron demand Diels–Alder reaction between 3-monosubstituted s-tetrazine and silylenolethers and obtained functionalized pyridazines. In the case of 1-monosubstituted silylenolethers, exclusive regioselectivity was observed. Downstream functionalization of the resulting 3-bromo-pyridazines was demonstrated utilizing several cross-coupling