摘要:
Novel 1,3-diazaadamantane structures 3 and 6 were prepared from tetrahyd to (-)-cytisine 1 using intermolecular conversions within the bispidine moiety. 2-Oxo derivative 6 was synthesized using a microwave-assisted procedure, which reduces the reaction time and increases the purity of the crude reaction mixture. Alternative possibilities of intermolecular cyclizations were also explored. Though less successful, they provided interesting insights into the chemistry of bispidine systems. (C) 2004 Elsevier Ltd. All rights reserved.