Synthetic Secofriedelane and Friedelane Derivatives as Inhibitors of Human Lymphocyte Proliferation and Growth of Human Cancer Cell Lines in Vitro
作者:Cristina Moiteiro、Fátima Justino、Regina Tavares、M. J. Marcelo-Curto、M. Helena Florêncio、Maria São José Nascimento、Madalena Pedro、Fátima Cerqueira、Madalena M. M. Pinto
DOI:10.1021/np010217m
日期:2001.10.1
Controlled silylation of friedelin (1) fromcorksmokerwashsolids, a byproduct generated during processing of corkboard by steam baking, gave 3-trimethylsiloxyfriedel-2-ene (3) in high yields. Oxidation of 3 with OsO(4)/NMMO produced 2alpha-hydroxyfriedelan-3-one (cerin) (5), from which the new 2,3-secofriedelan-2-al-3-oic acid (6) was obtained quantitatively by periodic acid oxidation. Oxidation
Dutta, G.; Bose, S. N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1989, vol. 28, # 1-11, p. 975 - 977
作者:Dutta, G.、Bose, S. N.
DOI:——
日期:——
Friedelane triterpenoids: transformations toward A-ring modifications including 2-<i>homo</i>derivatives
作者:Jayanta Das、Antara Sarkar、Pranab Ghosh
DOI:10.1039/c8nj00009c
日期:——
triterpenoid 3-chlorofriedel-2-ene-2-carbaldehyde, which was isolated as the major product from the reaction of friedelin with the novel Vilsmeier–Haack reagent. New A-ring modified derivatives were also obtained due to further interesting transformations of 3-chlorofriedel-3-ene, isolated as side products from the same reaction. Again, considering the scope of the 3-chloro-2-enal moiety associated with