A novel series of HDACinhibitors demonstrating classI and IIb subtype selectivity have been identified using a scaffold-hopping strategy. Several designed compounds showed better selectivity for classI and IIb over class IIa HDAC isoforms comparing to the FDA approved HDAC targeting drug SAHA. A representative lead compound 22 bearing a biphenyl moiety demonstrated promising classI and IIb HDAC
Structure Determination of an Endogenous Sleep-Inducing Lipid, <i>cis</i>-9-Octadecenamide (Oleamide): A Synthetic Approach to the Chemical Analysis of Trace Quantities of a Natural Product
作者:Benjamin F. Cravatt、Richard A. Lerner、Dale L. Boger
DOI:10.1021/ja9532345
日期:1996.1.1
The pursuit of endogenous sleep-inducing substances has been the focus of an extensive, complicated body of research. Several compounds, including Delta-sleep-inducing peptide and prostaglandin D-2, have been suggested to play a role in sleep induction, and yet, the molecular mechanisms of this physiological process remain largely unknown. In recent efforts, the cerebrospinal fluid of deep-deprived cats was analyzed in search of compounds that accumulated during sleep deprivation. An agent with the chemical formula C18H35NO was found to cycle with sleep-wake patterns, increasing in concentration with sleep deprivation and decreasing in amount upon recovery sleep. Since the material was generated in minute quantities and only under the special conditions of sleep deprivation, efforts to isolate sufficient material for adequate characterization, structure identification, and subsequent detailed evaluation of its properties proved unrealistic. With the trace amounts of the impure endogenous compound available, extensive MS studies on the agent were completed, revealing key structural features of the molecule including two degrees of unsaturation, a long alkyl chain, and a nitrogen substituent capable of fragmenting as ammonia. Additionally, HPLC traces suggested a weak UV absorbance for the unknown material. With this data in hand and encouraged by the relatively small size of the molecule, MW = 281, a synthetic approach toward the structural identification of the natural compound was initiated. Herein, we report the full details of the synthesis and comparative characterization of candidate structures for this endogenous agent that led to the unambiguous structural correlation with synthetic cis-9-octadecenamide.
The Isolation and Synthesis of Novel Nematocidal Dithiocyanates from an Australian Marine Sponge, <i>Oceanapia </i>sp.
作者:Robert J. Capon、Colin Skene、Edward Hsiang-Te Liu、Ernest Lacey、Jennifer H. Gill、Kirstin Heiland、Thomas Friedel
DOI:10.1021/jo0106750
日期:2001.11.1
Bioassay-directed fractionation of the EtOH extract of an Oceanapia sp. collected off the northern Rottnest Shelf, Australia, has yielded three novel dithiocyanates, thiocyanatins A (1), B (2a), and C (2b). The structures were determined by detailed spectroscopic analysis and confirmed by total synthesis. In addition to featuring an unprecedented dithiocyanate functionality, thiocyanatins possess an unusual 1,16-difunctionalized n-hexadecane carbon skeleton and are revealed as a hitherto unknown class of nematocidal agents