Design, synthesis and cytotoxic evaluation of 4-methylidenepyrazolidin-3-ones
摘要:
Three series of new 4-methylidenepyrazolidin-3-ones with various substitution patterns were synthesized and tested for the cytotoxic activity against two human leukemia cell lines NALM-6 and HL-60 as well as MCF-7 breast cancer cell line. Several obtained methylidenepyrazolidinones exhibited high cytotoxic activity with IC50 values below 10 mu M, mainly against HL-60 leukemia cell line and two of them, 18d,e, displayed IC50 <= 5 mu M, against all tested cell lines. Structure activity relationship studies revealed that the presence of phenyl substituents on both ring nitrogen atoms and vinyl or phenyl substituents in position 5 are crucial for high activity. Selected methylidenepyrazolidinones were also tested on normal human umbilical vein endothelial cells (HUVEC) and pyrazolidinone 18a was found to be 5-fold more toxic against HL-60 than normal cells. (C) 2015 Elsevier Masson SAS. All rights reserved.
A Simplified Synthesis of the Diastereomers of Levuglandin E<sub>2</sub>
作者:Venkataraman Amarnath、Kalyani Amarnath、Tina Masterson、Sean Davies、L. Jackson Roberts
DOI:10.1081/scc-200048945
日期:2005.1.1
report a synthesis of Levuglandin E2, as a mixture of easily separable diastereomers (15‐E2‐isoketals). The key feature is the protection of its reactive aldehyde as dimethyl acetal, which is introduced with 2,2‐dimethoxyethanal and removed in minutes with Montmorillonite K‐10. The synthesis could be modified to the preparation of 15‐E2‐isoketals with stable isotopes or with radiolabels.
The synthesis of a new library of 4,4-disubstituted 3-methylidene-3,4-dihydro-2H-chroman-2-ones applying Horner-Wadsworth-Emmons methodology for the construction of an exo-methylidene moiety is reported. Corresponding 3-diethoxyphosphorylchroman-2-ones were synthesized in a three-step reaction sequence consisting of O-methylation of ethyl 2-diethoxyphosphoryl-3-oxoalkanoates, followed by reaction of
Versatile Synthesis of 4-Methylidenepyrazolidin-3-ones Using a Horner–Wadsworth–Emmons Approach
作者:Tomasz Janecki、Jakub Modranka、Rafał Jakubowski
DOI:10.1055/s-0033-1340071
日期:——
A new, versatile method for the synthesis of, so far unknown, variously substituted 4-methylidenepyrazolidin-3-ones as potential cytotoxic agents is described. Target compounds were synthesized from the corresponding 4-diethoxyphosphorylpyrazolidin-3-ones which were used as Horner-Wadsworth-Emmons reagents for the olefination of formaldehyde. 4-Phosphorylpyrazolidin-3-ones were, in turn, obtained starting from the sodium salt of ethyl 2-diethoxyphosphoryl-3-hydroxy-2-propenoate, ethyl 2-acyl-2-diethoxyphosphorylacetates, or 3-methoxy-2-diethoxyphosphorylacrylate and monosubstituted or 1,2-disubstituted hydrazines.