2-Azonianorbornene-2-spiro-1'-aziridinium triflate - A novel ethylene immonium ion equivalent: Application to a synthesis of physostigmine

Article abstract of DOI:10.1016/S0040-4039(00)60094-1

A unique protocol for either the aminoethylation or the N-methyl aminoethylation of carbonyl compounds featuring the preparation and use of a novel spiroaziridinium salt, 2-azonianorbornene-2-spiro-1'-aziridinium triflate 2, is described.