Sequential Intermolecular Radical Addition and Reductive Radical Cyclization of Tyrosine and Phenylalanine Derivatives with Alkenes via Photoinduced Decarboxylation: Access to Ring-Constrained γ-Amino Acids
Sequential radical addition to alkenes and reductive radical cyclization of phenylalanine and tyrosine derivatives via photoinduced decarboxylation furnished ring-constrained γ-amino acids under mild conditions. A variety of alkenes such as acrylamides and acrylic esters could be employed in the photoinduced radical cascade cyclization. The yields of the ring-constrained γ-amino acids are dependent on the electron-accepting ability and steric hindrance of the alkene used. The proposed sequential reaction can also be applied for direct tethering of dipeptides to yield unique ring-constrained tetrapeptides.
DIRECT SYNTHESIS OF 18F-FLUOROMETHOXY COMPOUNDS FOR PET IMAGING AND THE PROVISION OF NEW PRECURSORS FOR DIRECT RADIOSYNTHESIS OF PROTECTED DERIVATIVES OF O-([18F]FLUOROMETHYL) TYROSINE
The invention describes novel direct synthesis methods for converting a precursor into a PET-tracer with a 18F-fluoromethoxy-group. The invention is also directed to novel and stable precursors for the direct radiosynthesis of protected derivatives of O- ([18F]Fluoromethyl) tyrosines.
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Page/Page column 80-81
(2013/03/26)
New precursors for direct radiosynthesis of protected derivatives of O-([18F]Fluoromethyl) tyrosine
The invention describes novel and stable precursors for the direct radiosynthesis of protected derivatives of O-([18F]Fluoromethyl) tyrosines, and methods for obtaining thoses compounds.
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Paragraph 0203-0210
(2013/03/26)
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