Stereoselective conjugate addition of aryl- and alkenylboronic acids to acyclic gamma,delta-oxygen-substituted alpha,beta-enoates.
The substrate-controlled RhI-catalyzed conjugate addition of aryl- and alkenylboronic acids to alpha,beta-unsaturated esters which bear gamma- and delta-oxygen substituents takes place in a highly anti diastereoselective fashion either when using gamma-hydroxyl unprotected starting materials or when the gamma-oxygen substituent is protected with a nonbulky group. The delta-oxygen substituent plays a role in the stereoselectivity of the reaction, and better results are obtained when this OH-group is protected.
Segura
Amaya
A
Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, 28040-Madrid, Spain.
Csakÿ
Aurelio G
AG