An iron‐catalyzed denitrogenative rearrangement of 1,2,3,4‐tetrazole is developed over the competitive C(sp3)–H amination. This catalytic rearrangement reaction follows an unprecedented metalloradical activation mechanism. Employing the developed method, a wide number of complex‐N‐heterocyclic product classes have been accessed. The synthetic utility of this radical activation method is showcased with
catalytic amount of Fe(TPP)Cl and Zn dust. The reaction precludes the traditional, more favored click reaction between an organic azide and alkynes, and instead proceeds by an unprecedented metalloradicalactivation. The method is anticipated to advance access to the construction of important basic nitrogen heterocycles, which will in turn enable discoveries of new drug candidates.
denitrogenative C(sp3)-Hamination of 1,2,3,4-tetrazoles bearing unactivated primary, secondary and tertiary C-H bonds is discovered. This cata-lytic amination follows an unprecedented metalloradical activation mechanism. The utility of the developed method is showcased with the short synthesis of a bioactive mole-cule. Moreover, an initial effort has been embarked for the enantioselective C(sp3)-H amination
Synthesis of Tetrazolo[1,5-<i>a</i>]pyridines Utilizing Trimethylsilyl Azide and Tetrabutylammonium Fluoride Hydrate
作者:Gregory Cuny、Joydev Laha
DOI:10.1055/s-0028-1083233
日期:2008.12
A method for the preparation of tetrazolo[1,5- A]pyridines from 2-halopyridines,utilizing trimethylsilyl azide in the presence of tetrabutylammoniumfluoride hydrate, is described. In addition, 8-bromotetrazolo[1,5- A]pyridine is further transformed intoa variety of novel tetrazolo[1,5- A]pyridinederivatives.
An efficient strategy for the intramolecular denitrogenative transannulation/C(sp2)-H amination of 1,2,3,4-tetrazoles bearing C8-substituted arenes, heteroarenes, and alkenes is described. The process involves the generation of the metal-nitrene intermediate from tetrazole by the combination of [Cp*IrCl2]2 and AgSbF6. It has been shown that the reaction proceeds via an unprecedented electrocyclization