Syntheses and Biological Activities of a Novel Group of Steroidal Derived Inhibitors for Human CDC25A Protein Phosphatase
摘要:
Silica gel supported pyrolysis of an azido-homo-oxa steroid led to rearrangement, presumably by a mechanism similar to that of solution phase Schmidt fragmentation, to produce a group of novel inhibitors for the oncogenic cell cycle regulator Cdc25A phosphatase. Cyano-containing acid 17, one of the best inhibitors in this group, inhibited the activity of Cdc25A protein phosphatase reversibly and noncompetitively with an IC50 value of 2.2 muM Structure-activity relationships revealed that a phosphate surrogate such as a carboxyl or a xanthate group is required for inhibitory activity, and a hydrophobic alkyl chain, such as the cholesteryl side chain, contributes greatly to the potency. Without the cyano group, acid 26 and xanthate 27 were found to be more selective over Cdc25A (IC50 = 5.1 muM and 1.1 muM, respectively) than toward CD45 (IC50 > 100 muM, in each case), a receptor protein tyrosine phosphatase. Several of these inhibitors showed antiproliferative activities in the NCI 60-human tumor cell line screen. These steroidal derived Cdc25 inhibitors provide unique leads for the development of dual-specificity protein phosphatase inhibitors.
Syntheses and Biological Activities of a Novel Group of Steroidal Derived Inhibitors for Human CDC25A Protein Phosphatase
作者:Hairuo Peng、Wenge Xie、Diane M. Otterness、John P. Cogswell、Randy T. McConnell、H. Luke Carter、Garth Powis、Robert T. Abraham、Leon H. Zalkow
DOI:10.1021/jm0004401
日期:2001.3.1
Silica gel supported pyrolysis of an azido-homo-oxa steroid led to rearrangement, presumably by a mechanism similar to that of solution phase Schmidt fragmentation, to produce a group of novel inhibitors for the oncogenic cell cycle regulator Cdc25A phosphatase. Cyano-containing acid 17, one of the best inhibitors in this group, inhibited the activity of Cdc25A protein phosphatase reversibly and noncompetitively with an IC50 value of 2.2 muM Structure-activity relationships revealed that a phosphate surrogate such as a carboxyl or a xanthate group is required for inhibitory activity, and a hydrophobic alkyl chain, such as the cholesteryl side chain, contributes greatly to the potency. Without the cyano group, acid 26 and xanthate 27 were found to be more selective over Cdc25A (IC50 = 5.1 muM and 1.1 muM, respectively) than toward CD45 (IC50 > 100 muM, in each case), a receptor protein tyrosine phosphatase. Several of these inhibitors showed antiproliferative activities in the NCI 60-human tumor cell line screen. These steroidal derived Cdc25 inhibitors provide unique leads for the development of dual-specificity protein phosphatase inhibitors.
Photoréactivité de dérivés de l'acide carbonique en milieu réducteur
作者:Vénimégué Albert Dembélé、Henri Deshayes、Jean-Pierre Pete
DOI:10.1016/s0040-4039(00)87649-2
日期:1982.1
Photoreduction of carbamates, thiocarbamates and carbonate occurs in a mixture of HMPTH2O. A better yield of alkane is observed for thiocarbamates. Formates and photoFries products are also isolated from the reaction mixture. Radical intermediates can be trapped by cyclohexene even in HMPA.