Diarylborinic Acid-Catalyzed Ring Opening of cis-4-Hydroxymethyl-1,2-Cyclopentene Oxides: Synthesis of 1,2,4-Trisubstituted Cyclopentanes

A diarylborinic acid-catalyzed ring opening of cis-4-hydroxymethyl-1,2-cyclopentene oxides was developed with N-nucleophiles including anilines, benzotriazole, and alkylamines, as well as S-nucleophiles, affording 1,2,4-trisubstituted cyclopentane compounds containing a quaternary carbon center. The mechanism study indicated that the half-cage structure formed by the epoxide substrate and the catalyst prevents the nucleophiles from attacking the inner side of the half-cage, resulting in the desired ring-opening product.

Automated summary

A diarylborinic acid-catalyzed ring opening reaction of cis-4-hydroxymethyl-1,2-cyclopentene oxides was developed, leading to the synthesis of 1,2,4-trisubstituted cyclopentane compounds containing a quaternary carbon center.