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2.3- Dioxa-5,7-diazabicyclo octanes

One such epidioxypiperazinedione has been reduced to a regular pyrazine. Thus l,4-dibenzyl-2,3-dioxa-5,7-diazabicyclo[2.2.2]octane-6,8-dione (86) underwent reduction by sodium borohydride in ethanol at 20°C during 1 h to afford 3,6-dibenzyl-3,6-dihydroxy-3,6-dihydro-2,5( l//, 4//)-pyrazincdione (86a) in 65% yield, confirmed in structure by dehydration to 3,6-dibenzylidene-3,6-dihydro-2,5(1 H, 4//)-pyrazincdionc (86b).5... [Pg.60]

Methyl-5,6-diphenyl-2(l/0-pyrazinone (204) gave 5-rnclhyl-4,8-diphenyl-2,3-dioxa-5,7-diazabicyclo[2.2.2]oct-7-en-6-one (205) (hv, O2, Rose Bengal, CH2CI2, 50°C 52%), and thence the MeOH adduct, 8-niethoxy-5-niethyl-4,8-diphenyl-2,3-dioxa-5,7-diazabicyclo[2.2.2]octan-6-one (206) (MeOH, 20°C, dark >95% or by conducting the irradiation in McOH)7 ° The subsequent catabolic reactions of these and related endoperoxides have been Studied 2,35,1073,1443... [Pg.224]

See other pages where 2.3- Dioxa-5,7-diazabicyclo octanes is mentioned: [Pg.984]    [Pg.81]    [Pg.60]    [Pg.207]    [Pg.224]    [Pg.984]    [Pg.60]    [Pg.60]    [Pg.984]   


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1.4- Diazabicyclo

1.4- Diazabicyclo octane

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