Ruthenium-catalyzed
propargylic reduction of propargylic alcohols
bearing a terminal alkyne moiety is accomplished by using Hantzsch
ester as a nucleophilic hydride source. A variety of secondary and
tertiary propargylic alcohols are reduced to the corresponding propargylic
reduced products such as 1-alkynes in excellent yields. Some mechanistic
studies indicate that ruthenium–allenylidene complexes may
work as key reactive intermediates.
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