Direct and Stereospecific Synthesis of
<i>N</i>
‐H and
<i>N</i>
‐Alkyl Aziridines from Unactivated Olefins Using Hydroxylamine‐
<i>O</i>
‐Sulfonic Acids
作者:Zhiwei Ma、Zhe Zhou、László Kürti
DOI:10.1002/anie.201705530
日期:2017.8.7
A RhII-catalyzed direct and stereospecific N-H- and N-alkyl aziridination of olefins is reported that uses hydroxylamine-O-sulfonic acids as inexpensive, readily available, and nitro group-free aminating reagents. Unactivated olefins, featuring a wide range of functional groups, are converted into the corresponding N-H or N-alkyl aziridines in good to excellent yields. This operationally simple, scalable
Syntheses and<sup>15</sup>N NMR Spectra of Iminodiaziridines - Ring-Expansions of 1-Aryl-3-iminodiaziridines to 1<i>H</i>- and 3a<i>H</i>-Benzimidazoles, 2<i>H</i>-Indazoles, and 5<i>H</i>-Dibenzo[<i>d</i>,<i>f</i>][1,3]diazepines
3-dihydro-3aH-benzimidazoles. Otherwise, 2-amino-1H-benzimidazoles and strongly fluorescent 3-amino-2H-indazoles, originating from rearrangements of the elusive 1-aryl-3-iminodiaziridines, predominate. N′,N″-Diaryl-N-hydroxyguanidine O-sulfonic acids give only rearranged products: a 2-amino-1H-benzimidazole and a 6-amino-5H-dibenzo[d,f][1.3]diazepine if aryl = phenyl, or a 2-imino-2,3-dihydro-3aH-benzimidazole
Cycloaddition reactions of quinoneimine N-oxides and of fluorenoneimine N-oxide: exocyclic nitrones conjugated with electron-withdrawing rings
作者:Jaffar A. Damavandy、Richard A. Y. Jones
DOI:10.1039/p19810000712
日期:——
N-Phenyl-p-benzoquinoneimine N-oxide is generally unreactive in 1,3-dipolar cycloaddition reactions, but with acetylenedicarboxylate esters it gives indolones, formed from the initial adducts by a rearrangement which entails an alkoxycarbonyl migration. The analogous nitrone derived from anthraquinone gives unrearranged adducts with a variety of 1,3-dipolarophiles; monosubstituted alkynes and alkenes
Synthesis of α-<i>C</i>-Stereochemically Pure Secondary Sulfonamides
作者:Vladyslav A. Andriashvili、Serhii Zhersh、Andrey A. Tolmachev、Oleksandr O. Grygorenko
DOI:10.1021/acs.joc.2c00480
日期:2022.5.6
sp3-enriched secondary sulfonamides bearing an asymmetric center at the α position to the sulfur atom is described. The method relies on the electrophilic amination of the corresponding stereochemically pure sulfinates with N-alkylhydroxylamine sulfonic acids (in turn easily prepared from N-alkylhydroxylamine and HSO3Cl). It is shown that the efficiency of the approach is governed mainly by steric factors;
dehydrogenation/remote hydrofunctionalization as a unified and versatile approach to selectively convert linear alkanes into a large array of valuable functionalized aliphatic derivatives is reported. The reaction goes through a site-selective functionalization at the unreactive primary C−H bonds of the linear alkane and avoids the use of linear α-olefins.