Convergent access to ketones, vinyl esters and vinyl bromides by a tin-free radical addition-intramolecular hydrogen atom transferDedicated with respect to Professor Gordon Whitham.
A Convergent Synthesis of Enantiopure Open-Chain, Cyclic, and Fluorinated α-Amino Acids
作者:Shi-Guang Li、Fernando Portela-Cubillo、Samir Z. Zard
DOI:10.1021/acs.orglett.6b00656
日期:2016.4.15
A radical based synthesis of a broad variety of protected enantiopure α-amino acids, including fluorinatedderivatives, is described. The radicaladdition furnishes naturally latent mercapto-α-amino acids ideally equipped for native chemical ligation.
Xanthate addition to 3-aryl-4-methanesulfonylbutene and structurallyrelated derivatives triggers a cascade involving aryl migrationand elimination of a sulfonyl radical, the result being an overallhomoallylation of the initial radical. Other slow migrating groupssuch as an ester can replace the aryl group.
Convergent access to ketones, vinyl esters and vinyl bromides by a tin-free radical addition-intramolecular hydrogen atom transferDedicated with respect to Professor Gordon Whitham.
作者:Gilles Ouvry、Samir Z. Zard
DOI:10.1039/b212841a
日期:2003.3.6
Xanthate-mediated intermolecular radical addition, hydrogen atom transfer and sulfonyl radical elimination have been efficiently combined in a new convergent synthesis of ketones and substituted olefins.