N-[(1S)-10-Camphorsulphonyloxy]norborn-5-ene-endo-2,3-dicarboximide 2 under
went a Lossen type reaction with dicyclohexylmethylamine to furnish endo-2-
methoxycarbonyl-endo-3-(methoxycarbonyl-amino)norborn-5-ene 3, in 84% yield
and 33% e.e. (by NMR). (C) 2000 Elsevier Science Ltd. All rights reserved.