Oxidation of 7,8‐diaminotheophylline with lead tetraacetate and reaction of the oxidation product, 6‐cyanoimino‐5‐diazo‐1,3‐dimethylpyrimidine‐2,4‐dione with alcohols or amines | Zendy

Ueda Taisei | Zendy; Yatsuzuka Naoyoshi | Zendy; Nagai ShinIchi | Zendy; Okada Kumiko | Zendy; Takeichi Emi | Zendy; Segi Hiromi | Zendy; Sakakibara Jinsaku | Zendy

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Oxidation of 7,8‐diaminotheophylline with lead tetraacetate and reaction of the oxidation product, 6‐cyanoimino‐5‐diazo‐1,3‐dimethylpyrimidine‐2,4‐dione with alcohols or amines

Author(s) -

Ueda Taisei,

Yatsuzuka Naoyoshi,

Nagai ShinIchi,

Okada Kumiko,

Takeichi Emi,

Segi Hiromi,

Sakakibara Jinsaku

Publication year - 2001

Publication title -

journal of heterocyclic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.321

H-Index - 59

eISSN - 1943-5193

pISSN - 0022-152X

DOI - 10.1002/jhet.5570380120

Subject(s) - chemistry , yield (engineering) , medicinal chemistry , diazo , methanol , ethanol , alkyl , propylamine , toluene , organic chemistry , alkoxy group , amine gas treating , materials science , metallurgy

Oxidation of 7,8‐diaminotheophylline (1) with lead tetraacetate in refluxing toluene gave a mixture of 3‐amino‐5,7‐dimethylpyrimido[4,5‐ e ][1,2,4]triazine‐6,8‐dione ( 2 ) and 6‐cyanoimino‐5‐diazo‐1,3‐dimethylpyrimidine‐2,4‐dione ( 4 ). The latter was transformed to 2 by the reaction with 1‐propanethiol in quantitative yield. The reaction of 4 with methanol, ethanol and 1‐propanol in the presence of rhodium ( II ) acetate gave 5‐alkoxy‐6‐(2‐alkyl‐3‐isoureido)‐1,3‐dimethylpyrimidine‐2,4‐diones ( 7a‐c ). A similar reaction of 4 with alkylamines such as n ‐propylamine, n ‐butylamine, isobutylamine and n ‐hexylamine gave a mixture of 7‐alkyl‐8‐aminotheophyllines ( 8a‐d ) and (5‐alkylamino‐1,3‐dimethyl‐2,4‐dioxopyrimidin‐6‐yl)cyanamides ( 9a‐d ).

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