Stereoselective Synthesis of
(25<i>R</i>)-Dafachronic Acids and (25<i>R</i>)-Cholestenoic Acid as Potential Ligands
for the DAF-12 Receptor in <i>Caenorhabditis
elegans</i>
Commercially available diosgenin has been used as starting material for a highly efficient synthesis of (25R)-dafachronic acids and (25R)-cholestenoic acid, potential ligands for the receptor DAF-12 in the nematode Caenorhabditis elegans.
Synthesis and biological activity of the (25R)-cholesten-26-oic acids—ligands for the hormonal receptor DAF-12 in Caenorhabditis elegans
作者:René Martin、Arndt W. Schmidt、Gabriele Theumer、Tilo Krause、Eugeni V. Entchev、Teymuras V. Kurzchalia、Hans-Joachim Knölker
DOI:10.1039/b817358c
日期:——
We describe the stereoselective transformation of diosgenin (4a) to (25R)-Î4-dafachronic acid (1a), (25R)-Î7-dafachronic acid (2a), and (25R)-cholestenoic acid (3a), which represent potential ligands for the hormonal receptor DAF-12 in Caenorhabditis elegans. Key-steps of our synthetic approach are a modified Clemmensen reduction of diosgenin (4a) and a double bond shift from the 5,6- to the 7,8-position. In the 25R-series, the Î7-dafachronic acid 2a exhibits the highest hormonal activity.
An Efficient, Stereocontrolled Synthesis of the 25-(<i>R</i>)-Diastereomer of Dafachronic Acid A from β-Ergosterol
作者:Simon Giroux、E. J. Corey
DOI:10.1021/ol702936f
日期:2008.3.1
A direct and stereocontrolled synthesis of the 25-(R)-diastereomer of dafachronic acid A from beta-ergosterol has been developed.
Mixed Bioengineering–Chemical Synthesis Approach for the Efficient Preparation of Δ7-Dafachronic Acid
作者:Matias I. Kinzurik、Lachezar V. Hristov、Seiichi P. T. Matsuda、Zachary T. Ball
DOI:10.1021/ol5006642
日期:2014.4.18
Combining bioengineering with chemical synthesis has enabled an efficient method for producing 6,Delta 7-dafachronic acid, a steroidal hormone associated with nematode germline longevity. Saccharomyces cerevisiae was engineered to produce 7,24-cholestadienol, a convenient starting material for a four-step synthesis of Delta 7-dafachronic acid.
A Photocleavable Masked Nuclear‐Receptor Ligand Enables Temporal Control of
<i>C. elegans</i>
Development
作者:Joshua C. Judkins、Parag Mahanti、Jacob B. Hoffman、Isaiah Yim、Adam Antebi、Frank C. Schroeder
DOI:10.1002/anie.201307465
日期:2014.2.17
The development and lifespan of C. elegans are controlled by the nuclear hormone receptor DAF‐12, an important model for the vertebrate vitamin D and liver X receptors. As with its mammalian homologues, DAF‐12 function is regulated by bile acid‐like steroidal ligands; however, tools for investigating their biosynthesis and function in vivo are lacking. A flexible synthesis for DAF‐12 ligands and masked