Synthetic Communications p. 2433 - 2444 (1997)
Update date:2022-08-11
Topics:
El-Saghier, Ahmed M. M.
Maihub, Abdussalam A.
Al-Shirayda, Hatif A.
The ketene-S,S-acetal I was prepared under phase-transfer catalysis (PTC) in benzene-carbonate two phase system using tetrabutylammonium bromide as the catalyst. Upon treatment with 1,2-diaminoethane, followed by hydrolysis with sodium methoxide, I gave 2-(2-oxopropylidene) imidazoline III. Bromination of III and replacement of bromine by hydrazine afforded 2- (1-hydazino-1,2-oxopropylidene) imidazoline V. Compound V was used as a precursor for the preparation of the previously unreported fused nitrogen heterocyclic ring system of imidazotriazine VI, VIII, XI, XII and imidazotriazepine IX, X.
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