Complexes of cyclomaltoheptaose with aromatic diazo compounds: Formation and reactions
作者:Christopher J. Abelt、Jonathan S. Lokey、Shelley H. Smith
DOI:10.1016/0008-6215(89)85172-9
日期:1989.10
Pyrolysis of the relatively stable, solid complexes of cyclomaltoheptaose (β-cyclodextrin) with phenyldiazomethane, 1-diazo-1-phenylethane, and diazo-(diphenyl)methane results in degradation of the labile guests. The host matrix exerts “reaction-vessel” and “shape-selectivity” effects upon the reaction pathways of the guests and derivatives. The carbene insertion reaction with the β-cyclodextrin hydroxyl groups
Improved Zinc-Catalyzed Simmons–Smith Reaction: Access to Various 1,2,3-Trisubstituted Cyclopropanes
作者:Éric Lévesque、Sébastien R. Goudreau、André B. Charette
DOI:10.1021/ol500267w
日期:2014.3.7
The Simmons–Smith reaction of zinccarbenoids with alkenes is a powerful method to access cyclopropanes containing various substitution patterns. This work exploits the high reactivity of aryldiazomethanes toward zinc halides to generate aryl-substituted carbenoids catalytically. These carbenoids are able to cyclopropanate various alkenes diastereoselectively, including unfunctionalized substrates
Asymmetric Copper-Catalyzed Carbozincation of Cyclopropenes en Route to the Formation of Diastereo- and Enantiomerically Enriched Polysubstituted Cyclopropanes
作者:Daniel S. Müller、Ilan Marek
DOI:10.1021/jacs.5b11220
日期:2015.12.16
The enantioselective synthesis of cyclopropylzinc reagents has been achieved via a copper-catalyzed carbozincation of 3,3-disubstituted cyclopropenes with diorganozincreagents. The obtained organozinc compounds can be easily functionalized with a broad range of electrophiles, including palladium-catalyzed cross-couplings, affording highly substituted cyclopropanes. The operationally simple procedure
Iron-catalyzed synthesis of cyclopropanes by <i>in situ</i> generation and decomposition of electronically diversified diazo compounds
作者:Emmanuelle M. D. Allouche、Afnan Al-Saleh、André B. Charette
DOI:10.1039/c8cc07060a
日期:——
The modular synthesis of a variety of trans 1,2-disubstituted cyclopropanes in a safe and user-friendly one-pot iron-catalyzed cyclopropanation reaction is described. Easily synthesized N-nosylhydrazones are used as diazo precursors, allowing the in situ generation of electron-rich diazo compounds under mild reaction conditions and their direct participation in the cyclopropanation reaction.
Catalytic Cyclopropanation of Alkenes Using Diazo Compounds Generated in Situ. A Novel Route to 2-Arylcyclopropylamines
作者:Varinder K. Aggarwal、Javier de Vicente、Roger V. Bonnert
DOI:10.1021/ol0164177
日期:2001.8.1
[reaction: see text]. A user-friendly, one-pot process for catalyticcyclopropanation of alkenes from tosylhydrazones is described. The cyclopropanation of N-vinylphthalimide provides a new route to 2-arylcyclopropylamines, and this is exemplified in the efficient synthesis of the HIV-1 reverse transcriptase inhibitor 6.