First synthesis and pharmacological evaluation of benzoindolizidine and benzoquinolizidine analogues of α- and β-peltatin
摘要:
The benzoindolizidine and-quinolizidine analogues of alpha- and beta-peltatin were designed and synthesized by two different synthetic routes involving as the key step the Bischler-Napieralski cyclization of suitably substituted N-acyl-2-arylmethylpyrrolidine and -piperidine derivatives. The in vitro biological activity of these analogues as well as some of their derivatives was subsequently evaluated. (C) 2000 Elsevier Science Ltd. All rights reserved.
The alkaloids (±)-cryptopleurine 1, (±)-antofine 2, and (±)-deoxypergularinine 3 were synthesized by Pictet-Spengler cyclization of the 2-arylmethylpiperidine and -pyrrolidines 4, 5 and 6 obtained by sequential N-deprotection-reduction of the parent enecarbamates 7, 8 and 9. These latter were made by the Horner reaction of phosphorylated carbamates 12 and 13 with the appropriate aldehydes 10 and 11