Nucleophilic Substitution by Grignard Reagents on Sulfur Mustards
作者:Antonella Converso、Pierre-Loïc Saaidi、K. Barry Sharpless、M. G. Finn
DOI:10.1021/jo0489869
日期:2004.10.1
With proper activation of the leaving group, sulfur mustards react with Grignard reagents with neighboringgroupparticipation of the sulfur atom. 2,6-Dichloro-9-thiabicyclo[3.3.1]nonane is especially useful in this regard, providing clean reactivity with organomagnesium nucleophiles on a topologically constrained scaffold.
A Simple Method for the Preparation of <i>N</i>-Sulfonylsulfilimines from Sulfides
作者:Andreas L. Marzinzik、K. Barry Sharpless
DOI:10.1021/jo0012039
日期:2001.1.1
While excellent methods exist for the oxidation of sulfides to sulfoxides R1R2S-->R1R2SO, the azaversion of this atom transfer redox process, i.e., R1R2S-->R1R2S=N-SO2R3, has been less reliable. In sulfilimine synthesis, sulfoxide has been an inevitable byproduct in all cases to date, and the yields of sulfilimine have varied widely. A nearly ideal procedure for the sulfide to sulfonyl sulfilimine
Photochemical and assisted cleavages of halo-9-thiabicyclononanes
作者:Peter Heggison McCabe、Chine Isaac de Jenga、Angus Stewart
DOI:10.1016/s0040-4039(01)81992-4
日期:1981.1
2,6-Dichloro-9-thiabicyclo[3.3.1]nonane: A Privileged, Bivalent Scaffold for the Display of Nucleophilic Components
作者:Antonella Converso、Kristina Burow、Andreas Marzinzik、K. Barry Sharpless、M. G. Finn
DOI:10.1021/jo015632y
日期:2001.6.1
The title compound, the condensation product of sulfur dichloride and 1,5-cyclooctadiene, is a reliable acceptor of a wide variety of heteroatom nucleophiles, sometimes in reversible fashion. Optical resolution of the core structure has been achieved and preserved in succeeding transformations. The high reactivity and reliable stereochemical control afforded by this system illustrates the power of neighboring-group participation by the sulfur center.
Thia-, Aza-, and Selena[3.3.1]bicyclononane Dichlorides: Rates vs Internal Nucleophile in Anchimeric Assistance
作者:Adrian A. Accurso、So-Hye Cho、Asmarah Amin、Vladimir A. Potapov、Svetlana V. Amosova、M. G. Finn
DOI:10.1021/jo102440k
日期:2011.6.3
Sulfur-, selenium-, and nitrogen-containing compounds bearing leaving groups in the beta-position undergo facile substitution chemistry enabled by anchimeric assistance. Here we provide direct comparisons between such systems in the rigid bicyclo[3.3.1]nonane framework easily derived from 1,5-cyclooctadiene. For a series of dichloride electrophiles of this type, the relative reactivities were found to be Se >> (alkyl)N > S >= (propargyl)N > (phenyl)N, with the reaction rates at the two extremes differing by more than 3 orders of magnitude. For the N-alkyl case, substitution rates were largely independent of the trapping nucleophile but were strongly dependent on solvent, showing that the process is controlled by the formation of the high-energy three-membered cationic intermediate.