作者:Joyann S. Barber、Evan D. Styduhar、Hung V. Pham、Travis C. McMahon、K. N. Houk、Neil K. Garg
DOI:10.1021/jacs.5b13304
日期:2016.3.2
two stereogenic centers. DFT calculations of stepwise and concerted reaction pathways are used to rationalize the observed selectivities. Moreover, the strategic manipulation of nitrone cycloadducts demonstrates the utility of this methodology for the assembly of compounds bearing multiple heterocyclic units. These studies showcase the exploitation of a traditionally avoided reactive intermediate in chemical
Synthesis and Utilization of Nitroalkyne Equivalents in Batch and Continuous Flow
作者:Peter D. Morse、Timothy F. Jamison
DOI:10.1002/anie.201706157
日期:2017.11.6
reactivity of these silyltriflates, which are prepared in situ, is exemplified by dipolar cycloadditionreactions with nitrones to give highly substituted 4-nitro-4-isoxazolines in high yields. This approach has proven general for several different alkyl and aryl substituted alkynes. In order to minimize the accumulation of potentially hazardous reaction intermediates, we have also developed a continuous
A compound represented by the figure (1) or a pharmaceutically acceptable salt thereof is useful as medicament for treating retinal degenerative disorders:
wherein Ar is optionally substitued phenyl or optionally substituted heteroaryl;.
n is 0, 1 or 2;
W is —CH2NH— or —CH═N(O)—;
R1, R2 and R3 are independently optionally substituted alkyl, carboxyl or alkoxycarbonyl; any two groups of R1, R2 and R3 may be taken together with the carbon atom to form optionally substituted cycloalkane; all of R1, R2 and R3 may be taken together with the adjusent carbon atom to form optionally substituted bicycloalkane or optionally substituted tricycloalkane;
R4 and R5 are independently hydrogen atom or optionally substituted alkyl.
photocatalytic aerobic oxidative dehydrogenation reactions of N,N-disubstituted hydroxylamines to nitrones were developed with an in situ generated photocatalyst based on commercially available 3,6-dichlorotetrazine. This process affords a wide range of nitrones in high yields under mild conditions. In addition, an oxidative (3+3) cycloaddition between an oxyallyl cation precursor and a hydroxylamine was also developed
Access to 2-naphthols <i>via</i> Ru(<scp>ii</scp>)-catalyzed C–H annulation of nitrones with α-diazo sulfonyl ketones
作者:Lingheng Kong、Xi Han、Xingwei Li
DOI:10.1039/c9cc02949d
日期:——
Efficient synthesis of 2-naphthols was realized by Ru(II)-catalyzed C–H activation of aryl nitrones and intermolecular [3+3] annulation with α-diazo sulfonyl ketones under redox-neutral conditions. Easily available α-diazo sulfonyl ketones act as a three-carbon component in the reaction.