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Ylides pyrylium, cycloaddition

Magnus pursued a strategy in which an intramolecular [5+2]-cycloaddition of the pyrylium ylide 266 afforded the oxygen bridged hydroazulene 267 (Eq. 6) [136, 137] ... [Pg.129]

Cycloaddition reactions of pyrylium salts with alkenes continue to be explored in the context of natural products synthesis, as shown in Schemes 12-14. In the example shown in Scheme 12, a pyrylium-ylide [5+2] cycloaddition was performed (128—> 129), allowing access to intermediates reminiscent of the core framework of the diterpene antibiotic, guanacastepene <2001TL4947>. [Pg.358]

In a study aimed at synthesizing the cyathin diterpene skeleton, another pyrylium ylide-alkene [5+2] cycloaddition was employed (as shown in Scheme 13) <1999T3553>. [Pg.358]


See other pages where Ylides pyrylium, cycloaddition is mentioned: [Pg.442]    [Pg.10]    [Pg.6580]   
See also in sourсe #XX -- [ Pg.442 ]




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