Nucleophilic addition of 1-(2-hydroxyalkyl)pyrroles to acetylene, an unactivated carbon–carbon
triple bond, in the presence of a base has been studied. As a result an atom-economic
synthetic method to obtain 1-[2-(vinyloxy)alkyl]pyrroles in good yields employing
superbase, sodium or potassium hydroxide in dimethyl sulfoxide, systems has been developed.
1-[2-(Vinyloxy)alkyl]pyrroles are cleaved by base with the elimination of vinyl alcohol
to give 1-vinylpyrroles.
Key words
acetylene - addition - alcohol - pyrrole - vinyl ether