Efficient construction of polycyclic alkaloid synthetic precursors by a xanthate free radical addition and Mannich cyclisation cascade
摘要:
Routes to synthetic precursors of Lupin and Eburna alkaloids have been developed. featuring the rapid construction of highly functionalised intermediates by the intermolecular radical coupling of xanthates and alkenes. followed by acid-mediated condensation-cyclisation. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis of substituted 3-arylpiperidines and 3-arylpyrrolidines by radical 1,4 and 1,2-aryl migrations
作者:Alexandru Gheorghe、Béatrice Quiclet-Sire、Xavier Vila、Samir Z. Zard
DOI:10.1016/j.tet.2007.04.091
日期:2007.7
A route to 3-arylpiperidines and 3-arylpyrrolidines involving radical 1,4- and 1,2-aryl migrations has been explored. For the piperidines, the first route requires a xanthate addition to an N-allylarylsulfonamide, followed by acetylation and treatment with lauroyl peroxide to give the corresponding 1,4-aryl transfer product. This compound can be converted into the desired piperidine derivative following
Free-Radical Variant for the Synthesis of Functionalized 1,5-Diketones
作者:Kelvin Kau Kiat Goh、Sunggak Kim、Samir Z. Zard
DOI:10.1021/ol402213k
日期:2013.9.20
A free-radical approach for the synthesis of functionalized 1,5-diketones has been accomplished through an effective combination play between alkenylacylphosphonates and keto-xanthates as radical surrogates of enolates and enones, respectively.
The present invention relates to a method for preparing a cyclic peptide with antiparasite activity and anticancer activity. The invention also relates to this peptide as an antiparasite agent, for example in the treatment of toxoplasmosis and as an anticancer agent. The invention also relates to the use of this cyclic peptide for treating organs ex vivo before transplantation.
4-Unsubstitued isoxazolinones derived from the corresponding
β-ketoesters can be chlorinated and converted into 1-chloroalkynes
upon treatment with sodium nitrite and ferrous sulfate in aqueous acetic
acid.
A Convergent and Flexible Approach to Hydroxylamines, Hydrazines and Related Structures
作者:Béatrice Quiclet-Sire、Benoît Sortais、Samir Z. Zard
DOI:10.1055/s-2002-31899
日期:——
Intermolecular xanthate transfer radical addition to protected allyl hydroxylamine or hydrazine provides a new, flexible, and convergent route to adducts which can be readily elaborated into complex aromatic or heterocyclic hydroxylamine or hydrazine derivatives.