SEARCH Articles Figures Tables A -Acyliminium cyclizations A-Acyliminium ion cyclization A-Acyliminium ion cyclization intramolecular Acyliminium Acyliminium ion cyclization Cyclization Pictet-Spengler acyliminium Cyclization acyliminium-mediated Elaeokanines via acyliminium ion terminated cyclization N-acyliminium ion cyclizations