Compounds and methods for modulating mesenchymal cell function, for instance smooth muscle and fibroblast proliferation or cytokine expression, and for treating conditions associated with mesenchymal cell function, for instance airway hyperresponsiveness associated with asthma. The compounds also supress inflammation. The compounds are a class of estratriene derivates, and includes various derivatives of 2-methoxyestradiol comprising a group A, including a substituted aromatic substituent in the 2-, 6- or 17- position.
2′-Deoxy-2′-alkoxylaminouridines: Novel 2′-substituted uridines prepared by intramolecular nucleophilic ring opening of 2,2′-O-anhydrouridines
作者:David P. Sebesta、Sarah S. O'Rourke、Rogelio L. Martinez、Wolfgang A. Pieken、Danny P.C. McGee
DOI:10.1016/0040-4020(96)00870-8
日期:1996.11
methodology developed for the stereo- and regiospecific introduction of structural modifications at the 2′-position of uridine nucleosides. A novel class of modified nucleosides, 2′-alkoxylamino-2′-deoxy uridines, are prepared by intramolecularnucleophilic addition of a 3′-tethered alkoxycarbamate nucleophile to the 2′-position with concomitant opening of a 2,2′-anhydrouridine.
Compounds and methods for modulating mesenchymal cell function, for instance smooth muscle and fibroblast proliferation or cytokine expression, and for treating conditions associated with mesenchymal cell function, for instance airway hyperresponsiveness associated with asthma. The compounds also suppress inflammation. The compounds are a class of estratriene derivates, and includes various derivatives of 2-methoxyestradiol comprising a group A, including a substituted aromatic substituent in the 2-, 6- or 17-position.
In this paper, we describe a novel N–O photolysis of o-nitrobenzyl oxime ethers that enables the synthesis of phenanthridines via intramolecular cyclizationreactions. Without the use of additional photocatalysts or photosensitizers, the process proceeds with an efficiency of ≤96% upon exposure of the sample to near-visible light (405 nm) under aqueous conditions. Through the photoinduced production
在本文中,我们描述了一种新型的邻硝基苄基肟醚的 N-O 光解,它能够通过分子内环化反应合成菲啶。在不使用额外的光催化剂或光敏剂的情况下,在水性条件下将样品暴露于近可见光 (405 nm) 时,该过程的效率≤96%。通过在 HeLa 细胞中光诱导产生荧光菲啶衍生物,证明了生物条件下反应的进展。这种光诱导环化反应可用作不同的光化学仪器,通过诱导生物活性分子的产生来控制生物过程。
Total Synthesis of (+)-Sieboldine A: Evolution of a Pinacol-Terminated Cyclization Strategy
作者:Stephen M. Canham、David J. France、Larry E. Overman
DOI:10.1021/jo300872y
日期:2013.1.4
This article describes synthetic studies that culminated in the first total synthesis of the Lycopodium alkaloid sieboldine A. During this study, a number of pinacol-terminated cationic cyclizations were examined to form the cis-hydrindanone core of sieboldine A. Of these, a mild Au(I)-promoted 1,6-enyne cyclization that was terminated by a semipinacol rearrangement proved to be most efficient. Fashioning the unprecedented N-hydroxyazacyclononane ring embedded within the bicyclo[5.2.1]decane-N,O-acetal moiety of sieboldine A was a formidable challenge. Ultimately, the enantioselective total synthesis of (+)-sieboldine A was completed by forming this ring in good yield by cyclization of a protected-hydroxylamine thioglycoside precursor.