Synthetic Route to Phenyl Diazenes and Pyridazinium Salts from Phenylazosulfonates
作者:Susanne Gradl、Johannes Köckenberger、Janina Oppl、Martin Schiller、Markus R. Heinrich
DOI:10.1021/acs.joc.1c00013
日期:2021.5.7
synthesis of pyridazinium salts was achieved from readily available phenylazosulfonates in a single reaction step. The reaction proceeds via the formation of short-lived phenyldiazenes, which—owing to the strongly acidic conditions—are partially protonated. The phenyldiazenes then undergo a rapid cycloaddition to furans to give pyridazinium salts via elimination of water. The fact that the pyridazinium synthesis
Practical Fischer Indolization Using Bench-Stable Arylhydrazine Sulfonate as the Surrogate of Arylhydrazine
作者:Yanping Zhu、Kaiwu Dong、Wenjuan Li、Chaoren Shen
DOI:10.1055/s-0043-1763622
日期:——
Fischer indolization using bench-stable sodium arylhydrazine sulfonate as a surrogate of arylhydrazine was developed. The preparation of arylhydrazine sulfonate was also modified by replacing sodium sulfite reductant with Pd-catalyzed hydrogen transfer. The straightforward synthesis of tetrahydrocarbazoles from the corresponding anilines was successfully conducted in a one-pot manner. A practical application