Atropisomerism about Aryl–Csp<sup>3</sup> Bonds: The Electronic and Steric Influence of <i>ortho</i>-Substituents on Conformational Exchange in Cannabidiol and Linderatin Derivatives
donor–acceptor charge transfer interactions. Conformationalcontrol arises from a combination of stereoelectronic and stericeffects between substituents in close contact with each other on the two rings of the endocyclic epoxide atropisomers. This study represents the first exploration of the stereoelectronic origins of atropisomerism around C(sp2)–C(sp3) single bonds through theoretical calculations.
phloroacetophenone and (−)-α-phellandrene, two commercially available reagents. In the diastereoselective epoxidation step, the analysis of the two endocyclic epoxide intermediates reveals a hindered sp2−sp3 rotation, which results in rotational diastereoisomers.