Bicyclo[1.1.1]pentane (BCP) replacement as a bioisostere in drug molecules has an influence on their permeability, aqueous solubility and in vitro metabolic stability. Thus, the chemical installation of the BCP unit into a chemical entity remains a significant challenge from a synthetic point of view. Here, we have presented a new approach for the installation of the BCP unit on the xanthate moiety
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
A Highly Stereoselective, Modular Route to (<i>E</i>)-Vinylsulfones and to (<i>Z</i>)- and (<i>E</i>)-Alkenes
作者:Marie-Gabrielle Braun、Béatrice Quiclet-Sire、Samir Z. Zard
DOI:10.1021/ja207944c
日期:2011.10.12
A recently discovered radical fragmentation of 2-fluoro-6-pyridinoxy derivatives allows a new highlystereoselective and convergent route to (E)-vinylsulfones from allylic alcohols. Reductive desulfonylation or nickel-catalyzed couplings furnish di- and trisubstituted (E)- and (Z)-alkenes.
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.
Radical Fragment Coupling Route to Geminal Bis(boronates)
作者:Qi Huang、Samir Z. Zard
DOI:10.1021/acs.orglett.8b02235
日期:2018.9.7
atom abstraction and delivers a vast array of highly functional geminal bis(boronates). The ability to assemble geminal bis(boronates) bearing polar functional groups not readily obtained through existing methods is particularly noteworthy. This approach also opens up access to geminal bis(boronyl) cyclopropanes and geminal bis(boronyl) tetrahydroquinolines.