Dedication
This work is dedicated to Professor S. Chandrasekaran on the occasion of his 80th
birthday
Abstract
Vinyl cyclopropanes are valuable functional groups in drugs or natural products as
well as established precursors to trigger a rich variety of synthetic transformations.
However, their reactive nature makes their installation challenging. We herein present
a modular access to highly diastereoselective (>20:1) dienal-cyclopropanes from rhodium-enalcarbenoids
and styrenes under mild conditions. This protocol was extended to synthesize a biologically
relevant substituted pyrroline scaffold. Overall, this Rh (II)-catalyzed cyclopropanation
exhibits good functional group tolerance, facile scalability, and selective access
to a diverse range of dienal cyclopropane motifs featuring an all-carbon ε-quaternary
stereocenter.
Keywords
Cyclopropanes - Dienalcarbenoids - Diazo compounds