Synthesis of Cyclopropanes via Organoiron Methodology: Preparation of rac-Dysibetaine CPa
摘要:
[Graphics]The cyclopropane containing betaine, rac-dysibetaine CPa, was prepared from (1-methoxycarbonylpentadienyl)-Fe-(CO)(2)PPh3+ by nucleophilic addition of nitromethane anion followed by oxidatively induced reductive elimination.
Synthesis of Cyclopropanes via Organoiron Methodology: Preparation of rac-Dysibetaine CPa
摘要:
[Graphics]The cyclopropane containing betaine, rac-dysibetaine CPa, was prepared from (1-methoxycarbonylpentadienyl)-Fe-(CO)(2)PPh3+ by nucleophilic addition of nitromethane anion followed by oxidatively induced reductive elimination.
γ-amino carboxylic acid dysibetaine CPa and five analogs in their racemic forms were successfully performed by taking advantage of an electron-withdrawing N-(4-nitrophenyl) group in the cyclopropanation reaction, the reductive ring opening of an imide, and the ethanolysis of an N-Boc-protected imide.
The first total syntheses of (−)-dysibetaine CPa and the antipode have been achieved using enantioselective solvolysis of meso-cyclic anhydride mediated by quinine derivative as an organocatalyst. The synthesis features a demonstration of an enantiodivergent organic synthesis of both enantiomers of dysibetaine CPa whereby the absolute configurations of natural product were elucidated as (3R,4R). Application