Highly Enantio‐ and Diastereoselective Construction of 1,2‐Disubstituted Cyclopentane Compounds by Dirhodium(II) Tetrakis[N‐phthaloyl‐(S)‐tert‐leucinate]‐Catalyzed C ? H Insertion Reactions of α‐Diazo Esters

A highly enantio- and diastereoselective intramolecular CH insertion reaction of α-diazo esters has been achieved with the use of dirhodium(II) tetrakis[N-phthaloyl-(S)-tert-leucinate] as a catalyst, providing exclusively cis-2-arylcyclopentane-1-carboxylates in up to 95% ee with no evidence of alkene formation.