S-Succinimidomethyl- and S-phthalimidomethyl xanthates are added efficiently to various alkenes resulting in an overall aminomethylation process. In contrast, under similar conditions, S-pyrrolidonyl xanthate gives rise mostly to oligomers. This unexpected difference in reactivity is attributed to the more important allylic character of the intermediate radical in the case of the imide derivative as compared to the lactam.
A new practical synthesis of tertiary S-alkyl dithiocarbonates and related derivatives
作者:Ghenwa Bouhadir、Nicolas Legrand、Béatrice Quiclet-Sire、Samir Z. Zard
DOI:10.1016/s0040-4039(98)02380-6
日期:1999.1
Decomposing a tertiary diazo derivative in the presence of a dithionodisulfide gives the corresponding tertiary thionosulfide (xanthate, dithiocarbamate, or dithioester) in good yield.
A novel synthesis of functional dithioesters, dithiocarbamates, xanthates and trithiocarbonates
作者:San H. Thang、(Bill)Y.K. Chong、Roshan T.A. Mayadunne、Graeme Moad、Ezio Rizzardo
DOI:10.1016/s0040-4039(99)00177-x
日期:1999.3
A novel synthesis of functional dithioesters, dithiocarbamates, xanthates and trithiocarbonates is described. Heating a bis(thiocarbonyl) disulfide with an azo-compound results in the formation of (thiocarbonyl)sulfanyl derivatives in moderate to high yield. The process is proposed as the method of choice for preparing tertiary (thiocarbonyl)sulfanyl compounds and is compatible with a wide range of
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.
Polymer–protein conjugates from ω-aldehyde endfunctional poly(N-vinylpyrrolidone) synthesised via xanthate-mediated living radical polymerisation
作者:Gwenaelle Pound、Jean M. McKenzie、Ronald F. M. Lange、Bert Klumperman
DOI:10.1039/b803952f
日期:——
Aldehyde omega-endfunctional poly(N-vinylpyrrolidone) was synthesised via quantitative conversion of a xanthate endfunctional precursor obtained via RAFT-mediated polymerisation.
Heavy metals can be avoided with a newradical equivalent of the Heck reaction for aliphatic derivatives in which iodide and dithiocarbonate substituents are replaced by substituted vinyl groups [Eq. (1)]. The reaction enables the introduction of vinyl fragments into a variety of functionalized substrates.