Gold(I)‐Catalyzed Allylation and Tandem Allylation–Cycloisomerization of Stannylated Propargyl Acetates with Allylsilanes
Year: 2025
Type: article
Abstract: Bicyclo[3.1.0]hex‐2‐enes, synthesized by the cycloisomerization of 1,5‐enynes, serve as key scaffolds in various natural products. Gold(I)‐catalyzed cycloisomerization of 1,5‐enynes is an efficient route to bicyclo[3.1.0]hex‐2‐enes. However, gold(I)‐catalyzed 1,5‐enyne synthesis, particularly with a terminal alkyne, has not yet been fully explored. This study presents a mild and general method for the gold(I)‐catalyzed allylation and tandem allylation–cycloisomerization of stannylated propargyl acetates with allylsilanes, yielding 1,5‐enynes with terminal alkyne moiety and bicyclo[3.1.0]hex‐2‐enes. The catalytic system ((4‐MeOC6H4)3PAuCl/AgSbF6) enabled the efficient synthesis of 1,5‐enynes with good to high yields and regioselectivities. In addition, gold(I)‐catalyzed tandem allylation–cycloisomerization using (JohnPhos)Au(MeCN)SbF6 afforded bicyclo[3.1.0]hex‐2‐enes with high regiocontrol. Stannylated propargyl acetates proved crucial in enhancing selectivity for both product classes.
Authors: Nene Murata, Sota Akima, Syed R. Hussaini, Yoshikazu Horino
Language: English
Topic: Catalytic Alkyne Reactions
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4409122583