Synthesis of Quaternary Amino Acids Bearing a (2‘Z)-Fluorovinyl α-Branch: Potential PLP Enzyme Inactivators
摘要:
Protected alpha-formyl amino acids, themselves available from the corresponding a-vinyl amino acids, are stereoselectively transformed into the (Z)-configured alpha-(2'-fluoro)vinyl amino acids via a three-step sequence. The route employs McCarthy's reagent, diethyl alpha-fluoro-alpha-(phenylsulfonyl)methyl phosphonate, and proceeds via the intermediate (E)-alpha-fluorovinyl sulfones and (E)-alpha-fluorovinyistannanes. The latter may either be exploited as novel cross-coupling partners for fluorovinyl branch extension or be globally deprotected, to provide the title compounds.
Synthesis of Quaternary Amino Acids Bearing a (2‘Z)-Fluorovinyl α-Branch: Potential PLP Enzyme Inactivators
摘要:
Protected alpha-formyl amino acids, themselves available from the corresponding a-vinyl amino acids, are stereoselectively transformed into the (Z)-configured alpha-(2'-fluoro)vinyl amino acids via a three-step sequence. The route employs McCarthy's reagent, diethyl alpha-fluoro-alpha-(phenylsulfonyl)methyl phosphonate, and proceeds via the intermediate (E)-alpha-fluorovinyl sulfones and (E)-alpha-fluorovinyistannanes. The latter may either be exploited as novel cross-coupling partners for fluorovinyl branch extension or be globally deprotected, to provide the title compounds.