This work proposed a new doping strategy by constructing a cascade reaction in organic hole transport layer (HTL) to achieve high-efficiency perovskite solar cells (PSCs). Owing to the dual functions of cascade reaction that is rapid and efficien...
Artikel
Arylative Ring Expansion of 3‐Vinylazetidin‐3‐Ols and 3‐Vinyloxetan‐3‐Ols to Dihydrofurans by Dual Palladium and Acid Catalysis
Von Wiley-VCH zur Verfügung gestellt
Time-resolved tandem catalysis: Palladium catalyzes the regioselective Heck reaction between A and B, while triflic acid mediates the skeleton rearrangement of the resulting Heck products D to dihydrofurans C.
Abstract
In contrast to the well-studied 1-vinylcyclobutanols, the reactivity of 3-vinylazetidin-3-ols 1 and 3-vinyloxetan-3-ols 2 under transition metal catalysis remains largely unexplored. We report herein their unique reactivity under dual palladium and acid catalysis. In the presence of a catalytic amount of Pd(OAc)2(PPh3)2, AgTFA and triflic acid, the reaction of 1 or 2 with aryl iodides affords 2,3,4-trisubstituted dihydrofurans, which are valuable heterocycles in organic synthesis. Mechanistic studies reveal that this arylative ring-expansion reaction proceeds via a domino process involving Heck arylation of alkene, acid-catalyzed transposition of allylic alcohol and ring opening of the azetidine/oxetane by an internal hydroxyl group.
Zum VolltextÜberprüfung Ihres Anmeldestatus ...
Wenn Sie ein registrierter Benutzer sind, zeigen wir in Kürze den vollständigen Artikel.