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Perhydropyrido pyrimidine, ring

Chlorination of the pyrido [ 1,2-a]pyrimidine (189) yielded a perchlorinated pyridine derivative (281).244 Perhydropyrido[l,2-a]pyrimidine (282) is sensitive towards acids, with ring cleavage to 283 taking place.191 The latter can be recyclized by alkali.192 Hydrogenation in concentrated hydrochloric acid over platinum(IV) oxide yields l-(3-aminopropyl)piperidine.192,342 Hydrogenation over Raney nickel in the presence of acetaldehyde leads to 1-ethylperhydropyrido [ 1,2-a]pyrimidine.237... [Pg.318]

The Bohlmann band appearing between 2650 and 2800 cm-1 in the IR spectra indicated that the unsubstituted perhydropyrido[l,2-n]pyrimidines contain the two rings in trans anellation.238,276,277... [Pg.323]

Perhydropyrido[ 1,2-a]pyrimidin-2-one 305 exhibits prototropic equilibrium and ring-chain tautomerism (92AP177). In methanol -d4 hexadeuter-ated bicyclic compounds were formed. [Pg.173]

See other pages where Perhydropyrido pyrimidine, ring is mentioned: [Pg.249]    [Pg.261]    [Pg.94]    [Pg.96]    [Pg.113]    [Pg.129]    [Pg.169]    [Pg.318]    [Pg.24]    [Pg.25]    [Pg.24]    [Pg.25]   


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