[Fe(F20TPP)Cl] catalyzed intramolecular C–N bond formation for alkaloid synthesis using aryl azides as nitrogen source
作者:Yungen Liu、Jinhu Wei、Chi-Ming Che
DOI:10.1039/c0cc01825b
日期:——
tetrahydroquinolines, dihydroquinazolinones and quinazolinones have been accomplished in moderate to excellent yields via [Fe(F(20)TPP)Cl] catalyzed intramolecular C-N bond formation usingarylazides as nitrogensource.
In order to investigate the reactivity of a photolytically generated arylnitrene with an intramolecular CH bond, the photochemistry of 2-(omega-phenylalkyl)phenyl azides (1a-d) was examined. Irradiation of 1 in solution revealed that the insertion of the nitrene into an adjacent CH bond to give cyclic compounds 4 and 5 occurs favorably only when a reactive CH bond, such as benzylic, is located close to the nitrenic center. This process can compete with the formation of products derived from triplet nitrene, but not with the capture of didehydroazepine by DEA. On the other hand, irradiation of 1b in an Ar matrix at 12 K gave a mixture of the CH insertion product 4b and the didehydroazepine 15. The origin of the difference in reactivity of the nitrene observed in solutions and in a matrix, and the spin state of the nitrene involved in the CH insertion reaction, are discussed.
Iron-Catalyzed Intramolecular Aminations of C(sp<sup>3</sup>
)−H Bonds in Alkylaryl Azides
作者:Isabel T. Alt、Claudia Guttroff、Bernd Plietker
DOI:10.1002/anie.201704260
日期:2017.8.21
The nucleophilic iron complex Bu4N[Fe(CO)3(NO)] (TBA[Fe]) catalyzes the direct intramolecular amination of unactivated C(sp3)−H bonds in alkylaryl azides, which results in the formation of substituted indoline and tetrahydroquinoline derivatives.
亲核铁配合物Bu 4 N [Fe(CO)3(NO)](TBA [Fe])催化烷基芳基叠氮化物中未活化的C(sp 3)-H键的直接分子内胺化,导致形成取代的二氢吲哚和四氢喹啉衍生物。
作者:Omar Villanueva、Nina Mace Weldy、Simon B. Blakey、Cora E. MacBeth
DOI:10.1039/c5sc01162k
日期:——
A dinuclear Co(ii) complex supported by a modular, tunable redox-active ligand system is capable of selective C–H amination to form indolines from aryl azides in good yields at low (1 mol%) catalyst loading.