Gold(I)-Catalyzed Diastereoselective Hydroacylation of Terminal Alkynes with Glyoxals
作者:Shuai Shi、Tao Wang、Vanessa Weingand、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201307685
日期:2014.1.20
The reaction of an α‐ketoaldehyde and a terminalalkyne in the presence of piperidine and a catalytic amount of AuCl delivers 1,2‐dicarbonyl‐3‐enes, products of the formal hydroacylation of the triple bond. The scope of the method is broad; different aryl substituents on the dicarbonyl unit and on the alkyne are well tolerated. The products can be transformed selectively into vinylquinoxalines. Mechanistic
A catalyst-free dehydrative coupling of 2-methylazaarenes with aldehydes ‘on water’ has been developed for efficient synthesis of (E)-2-alkenylazaarenes. The challenging addition/dehydration of aliphatic aldehyde was successfully implemented using water as a solvent. A variety of 2-methylazaarenes, aromatic and aliphatic aldehydes were well tolerated.
A photopolymerisable composition comprising at least one ethylenically unsaturated polymerisable compound, at least one quinoxaline compound, and at least one triazine compound.