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Selenium dioxide silica support

A selenium dioxide induced oxidative cyclization of the 2 -hydroxychalcone 745 is a key step in the total synthesis of ( )-5 -methoxyhydnocarin-D (Scheme 189) <2005T4149>. DMSO containing catalytic amounts of iodine also effectively promotes the oxidative cyclization of 2 -hydroxychalcones to afford flavones <1996CHEC-II>. The DMSO-iodine mediated cyclization of the bis(2 -hydroxychalcone) 746 is a key step in the synthesis of the natural atropisomer4 4 ",7,7 -tetra-O-methylcupressuflavone (Equation 298) <1997TL1087>. Likewise, silica gel supported indium(in) halides catalyze the oxidative cyclization of 2 -hydroxychalcones to afford flavones in excellent yield (Equation 299) <2005TL253>. [Pg.578]

Selenium dioxide has been used supported on silica gel in combination with r-butyl hydroperoxide in hexane or dichloromethane solution. ... [Pg.91]

See other pages where Selenium dioxide silica support is mentioned: [Pg.201]    [Pg.1758]    [Pg.201]   
See also in sourсe #XX -- [ Pg.843 ]

See also in sourсe #XX -- [ Pg.843 ]

See also in sourсe #XX -- [ Pg.7 ]

See also in sourсe #XX -- [ Pg.7 ]

See also in sourсe #XX -- [ Pg.843 ]



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Selenium dioxide

Silica support

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