Boronic Ester Enabled [2 + 2]-Cycloadditions by Temporary Coordination: Synthesis of Artochamin J and Piperarborenine B
Yanyao Liu, Dongshun Ni, M. Kevin Brown
Abstract
A strategy for the photosensitized cycloaddition of alkenylboronates and allylic alcohols by a temporary coordination is presented. The process allows for the synthesis of a diverse range of cyclobutylboronates. Key to development of these reactions is the temporary coordination of the allylic alcohol to the Bpin unit. This not only allows for the reaction to proceed in an intramolecular manner but also allows for high levels of stereo and regiocontrol. A key aspect of these studies is the utility of the cycloadducts in the synthesis of complex natural products artochamin J and piperarborenine B.
Topics & Concepts
ChemistryAllylic rearrangementIntramolecular forceCycloadditionAllylic alcoholStereochemistryCombinatorial chemistryOrganic chemistryCatalysisSynthetic Organic Chemistry MethodsAlkaloids: synthesis and pharmacologyMicrobial Natural Products and Biosynthesis