Highly efficient chiral 2-oxazolidinone auxiliaries derived from methylcyclopentadienes and 2-oxazolone

Article abstract of DOI:10.1016/S0040-4039(00)75800-X

Sterically congested [4+2]cycloadduct-based 2-oxazolidones, (1R,2R,6S,7S)-1, 7, 8, 9, 10, 10-hexamethyl- and (1S,2R,6S,7S,10R)-1, 7, 8, 9, 10, 10-pentamethyl-3-oxa-5-azatricyclo[5.2.1.0^2,6]dec-8-en-4-ones and their enantiomers, derived from hex