Repurposing π Electrophilic Cyclization/Dealkylation for Group Transfer
作者:Joseph A. Kaplan、Adena Issaian、Martin Stang、David Gorial、Suzanne A. Blum
DOI:10.1002/anie.202112351
日期:2021.12
Hijacking electrophiliccyclization intermediates allows for a pathway to acyclic tri- and tetrasubstituted alkenes with predictable regio- and stereochemistry. Mechanistic studies indicate concerted thioboration of the alkyne precedes rate-determining ring opening and investigate the effects of ring-size and functional groups on reaction selectivity.
The metal‐promoted nucleophilic addition of sulfur ylides to π‐systems is a well‐established reactivity. However, the driving force of such transformations, elimination of a sulfide moiety, entails stoichiometric byproducts making them unfavorable in terms of atom economy. In this work, a new take on sulfur ylide chemistry is reported, an atom‐economical gold(I)‐catalyzed synthesis of dihydrobenzo[b]thiepines
金属促进的硫叶立德与 π 体系的亲核加成是一种成熟的反应性。然而,这种转变的驱动力,即消除硫化物部分,会产生化学计量的副产物,使其在原子经济性方面不利。在这项工作中,报道了硫叶立德化学的新进展,即原子经济的金(I)催化合成二氢苯并[ b ]噻吩。反应在室温下温和条件下进行。