Abstract
The asymmetric deprotonation mediated by the chiral base s-butyllithium/(−)-sparteine of 4-substituted 5-hexynyl carbamates permits the synthesis of enantioenriched carbanionic pairs which undergo a regioselective 5- exo- dig ring closure with the triple bond acting as an internal electrophile. The functionalized five-membered rings are formed with complete stereoselectivity in high yields.
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