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Electrophile-mediated heteroatom cyclizations

PPI63R M. Frederickson and R. Grigg, Org. Prep. Proc. Int., 1997, 29, 63-115. Electrophile Mediated Heteroatom Cyclization onto C—C rr-Bonds. 2. Metal Ion Mediated Cyclization. V... [Pg.1489]

Allenes can also act as the -participant in electrophilic heteroatom cyclizations. Reviews of electrophilic additions to allenes discuss early examples of this type of cyclization.ld le-202 Numerous examples of cyclizations of a-functionalized allenes, including carboxylic acids, phosphonates, sulfinates and alcohols, to form five-membered heterocycles (equation 84) are cited in these reviews. The silver nitrate-mediated conversion of ot-allenic alcohols to 2,5-dihydrofurans203 has recently been applied to trimethylsilyl-substituted systems.204... [Pg.395]

Electrophile-mediated cyclization reactions of alkynes tethered to pendant heteroatom nucleophiles is an emerging strategy for the synthesis of heterocycles. This methodology has now been applied to the synthesis of pyrroles. The iodocyclization of 3-aminoalkynes 1 led to the formation of dihydropyrrole 2 <07TL7906>. Treatment of the latter with mesyl chloride in the presence of triethylamine then gave (i-iodopyrrolcs 3. [Pg.123]

See other pages where Electrophile-mediated heteroatom cyclizations is mentioned: [Pg.226]    [Pg.226]    [Pg.1100]    [Pg.279]   
See also in sourсe #XX -- [ Pg.226 ]



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Cyclization electrophilic

Cyclizations electrophilic heteroatom

Electrophiles mediated cyclizations

Electrophilic cyclizations

Electrophilic heteroatoms

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