A novel method for the stereospecificsynthesis of 1,5-disubstituted tetrazoles from ketoximes via the Beckmann rearrangement was developed using diphenyl phosphorazidate (DPPA) as both the oxime activator and azide source. Various ketoximes were transformed into the corresponding 1,5-disubstituted tetrazoles with exclusive trans-group migration and no E-Z isomerization of the ketoxime. This method
Amine-Free Approach toward<i>N</i>-Toluenesulfonyl Amidine Construction: A Phosphite-Mediated Beckmann-Like Coupling of Oximes and<i>p</i>-Toluenesulfonyl Azide
作者:Lauren M. Fleury、Erin E. Wilson、Monika Vogt、Tiffany J. Fan、Allen G. Oliver、Brandon L. Ashfeld
DOI:10.1002/anie.201305141
日期:2013.10.25
Atom hopping: A chlorophosphite‐mediated Beckmann ligation of oximes and p‐toluenesulfonyl azide gives access to N‐sulfonyl phosphoramidines in good to excellent yields. The reaction proceeds under exceptionally mild conditions and constitutes a bioorthogonal approach toward amidines by avoiding the use of amines and transition‐metal catalysts. dmp‐ol=3,3‐dimethylpropanediol.
Gas-Phase Acidities of Acetophenone Oximes. Substituent Effect and Solvent Effects
作者:Md. Mizanur Rahman Badal、Masaaki Mishima
DOI:10.1246/bcsj.20090246
日期:2010.1.15
Gas-phaseacidities (GA) of ring-substituted (E)-acetophenone oximes, XC6H4C(CH3)=NOH, were determined by measuring proton-transfer equilibria using an FT-ICR mass spectrometer. The magnitude of th...
Three component hydroxyletherification and hydroxylazidation of (trifluoromethyl)alkenes: access to α-trifluoromethyl β-heteroatom substituted tertiary alcohols
The three component hydroxyletherification and hydroxylazidation reactions of (trifluoromethyl)alkenes are reported, providing various useful α-trifluoromethyl β-heteroatom substituted tertiary alcohols in high yields.
Intramolecular Amido Transfer Leading to Structurally Diverse Nitrogen-Containing Macrocycles
作者:Heejeong Kim、Sukbok Chang
DOI:10.1002/anie.201700113
日期:2017.3.13
with either aryl or alkylazides. Facile generation of rhodacycles and metal imido intermediates was the key to success in this mechanistic scaffold to represent the first example of an intramolecular inner‐sphere C−H amination. While substrates bearing arylazides underwent a monomeric ring formation in high yields, a dimeric double cyclization took place exclusively with alkyl‐azide‐tethered ketoximes