Ring Opening of Donor–Acceptor Cyclopropanes with Acyclic 1,3-Diketones for the Synthesis of 1,6-Dicarbonyl Compounds
Dongxin Zhang, Hu Cai, Yan Chen, Lei Yin, Junchao Zhong, Ying Zhang, Qian‐Feng Zhang
Abstract
1,6-Dicarbonyl compounds, representing the formal addition products of the α-position of acetophenone derivatives to donor-acceptor cyclopropanes, were synthesized in two steps via first ring opening of donor-acceptor cyclopropanes with acyclic 1,3-diketones followed by DBU catalyzed retro-Claisen-type C-C bond cleavage reactions. In the first step, acyclic 1,3-diketones selectively worked as C-nucleophiles to add to donor-acceptor cyclopropanes. In the second step, the alkyl ketone part of the ring-opening products resulting from unsymmetrical 1,3-diketones was selectively cleaved in the presence of DBU in methanol.
Topics & Concepts
ChemistryRing (chemistry)AcceptorMedicinal chemistryStereochemistryCombinatorial chemistryOrganic chemistryCondensed matter physicsPhysicsCyclopropane Reaction MechanismsCatalytic Alkyne ReactionsAsymmetric Synthesis and Catalysis