New entry to the enantioselective formation of substituted cyclohexenes bearing an all-carbon quaternary stereogenic center

A Stereoselective Synthesis of Fused Carbocycles with a cis-1,2-Diol Moiety by Desymmetrization: SmI2-mediated Pinacol Coupling of meso-Cyclic 1,3-Diones

SmI₂-mediated desymmetrization of a meso-cyclic 1,3-dione pinacol coupling is described. The reaction proceeds with high stereoselectivity to provide fused carbocyclic compounds with three contiguous stereogenic centers featuring an all-carbon quaternary center and a cis-1,2-diol moiety.

Formal Synthesis of (-)-Haliclonin A: Stereoselective Construction of an Azabicyclo[3.3.1]nonane Ring System by a Tandem Radical Reaction

A formal synthesis of (-)-haliclonin A, isolated from the marine sponge Haliclona sp. in Korea, is described. The key feature of the synthesis includes the highly stereoselective tandem radical reaction to construct the azabicyclo[3.3.1]nonane core and the enantioselective formation of an all-carbon quaternary center via the Pd-mediated deracemization.