摘要:
Eight new 5 beta-hydroxy-spirostan-6-ones bearing hydroxy and amino functions in the A ring, i.e., 3 beta-OH, 3 alpha-OH, 2 beta,3 beta-OH, 2 alpha,3 beta-OH, 3 beta-NH2, 2 alpha-NH2-3 beta-OH, 2 beta-NH2-3 beta-OH, and 2 beta-OH-3 beta-NH2, were efficiently synthesized, and their antiecdysteroid activities were evaluated on the metamorphosis bioassay of mosquito Aedes aegypti. To our knowledge, these new steroids represent the first 5 beta-hydroxy-spirostanes which have been tested for antiecdysteroid activity in mosquitoes. The higher antagonistic effect was found for compounds bearing the 3 beta-hydroxy and 2 beta,3 beta-dihydroxy functionality which show promise as environmental friendly insecticides. (c) 2005 Elsevier Inc. All rights reserved.