AbstractThe tert‐butyl group is a common aliphatic motif extensively employed to implement steric congestion and conformational rigidity in organic and organometallic molecules. Because of the combination of a high bond dissociation energy (~100 kcal mol−1) and limited accessibility, in the absence of directing groups, neither radical nor organometallic approaches are effective for the chemical modification of tert‐butyl C−H bonds. Herein we overcome these limits by employing a highly electrophilic manganese catalyst, [Mn(CF3bpeb)(OTf)2], that operates in the strong hydrogen bond donor solvent nonafluoro‐tert‐butyl alcohol (NFTBA) and catalytically activates hydrogen peroxide to generate a powerful manganese‐oxo species that effectively oxidizes tert‐butyl C−H bonds. Leveraging on the interplay of steric, electronic, medium and torsional effects, site‐selective and product chemoselective hydroxylation of the tert‐butyl group is accomplished with broad reaction scope, delivering primary alcohols as largely dominant products in preparative yields. Late‐stage hydroxylation at tert‐butyl sites is demonstrated on 6 densely functionalized molecules of pharmaceutical interest. This work uncovers a novel disconnection approach, harnessing tert‐butyl as a potential functional group in strategic synthetic planning for complex molecular architectures.
The present invention provides novel compounds that are antagonists of PI3 kinase, PI3 kinase and tryosine kinase, PI3Kinase and mTOR, or PI3Kinase, mTOR and tryosine kinase.
Benzothiazole Kinase Inhibitors and Methods of Use
申请人:Intellikine LLC
公开号:US20150225407A1
公开(公告)日:2015-08-13
The present invention provides chemical entities or compounds and pharmaceutical compositions thereof that are capable of modulating lipid kinases such PI3 kinases, tryosine kinases and protein kinases such as mTOR. Also provided in the present invention are methods of using these compositions to modulate these kinases especially for therapeutic applications.
METHODS AND COMPOSITIONS FOR TREATMENT OF OPHTHALMIC CONDITIONS
申请人:Wilson Troy Edward
公开号:US20110269779A1
公开(公告)日:2011-11-03
The present invention provides chemical entities or compounds and pharmaceutical compositions thereof that are capable of modulating signal transduction by certain protein kinases such as mTor, tyrosine kinases, and/or lipid kinases such as PB kinase in an ocular tissue. Also provided in the present invention are methods of using these compositions to modulate activities of one or more of these kinases, especially for therapeutic applications.
Bicyclic-cannabinoids and methods of preparation and use are presented. These compounds, when administered in a therapeutically effective amount to an individual or animal, results in a sufficiently high level of that compound in the individual or animal to cause a physiological response. The physiological response may be useful to treat a number of physiological conditions.
The present invention provides novel compounds that are antagonists of PI3 kinase, PI3 kinase and tyrosine kinase, PI3 kinase and mTOR, or PI33 kinase, mTOR and tyrosine kinase.