Construction of NH‐Unprotected Spiropyrrolidines and Spiroisoindolines by [4+1] Cyclizations of γ‐Azidoboronic Acids with Cyclic
<i>N</i>
‐Sulfonylhydrazones
作者:Lucía López、María‐Paz Cabal、Carlos Valdés
DOI:10.1002/anie.202113370
日期:2022.1.10
N-sulfonylhydrazones of cyclic ketones are readily transformed into NH-free spirocyclic pyrrolidines and isoindolines by reaction with γ-azidoboronic acids. The transition-metal-free transformation is widely applicable and represents a new disconnection towards spirocyclic pyrrolidines. The application of the reaction in the modification of natural steroids and other biorelevant molecules highlights