Stereoselective Synthesis of 2,3-<i>cis</i>-2-Alkyl-5-oxo-3-silyloxycyclopentanecarboxylates using Dirhodium(II)-catalyzed Intramolecular C-H Insertion Reaction of 2-Diazo-3-oxo-5-silyloxyalkanoates
Dirhodium(II)-catalyzed intramolecular C-H insertion reaction of 5-(tert-butyldimethylsilyloxy)-2-diazo-3-oxoalkanoates in dichloromethane at room temperature gave stereoselectively 2,3-cis-2-alkyl-3-(tert-butyldimethylsilyloxy)-5-oxocyclopentanecarboxylates.