高效合成热力学不稳定的双取代环己烷
The Synthesis of Thermodynamically Disfavored Disubstituted Cyclohexanes
Thermodynamically disfavored disubstituted cyclohexanes are synthesized with excellent kinetic stereocontrol from readily available substituted methylenecyclohexanes based on chain-walking catalysis. Control experiments and theoretical calculations suggest that the initial introduction of bulky boron ester substitution away from the ring is crucial to the high diastereoselectivity. This finding opens a new adventure to the application of chain walking catalysis in organic synthesis and provides a ready access to thermodynamically disfavored but biologically important disubstituted cyclohexanes and the derivatives.
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