Reaction of 2-Phenylquinoxaline and of 2,3-Diphenylquinoxaline with Dimethyl Acetylenedicarboxylate 1
β Scribed by GROVENSTEIN, ERLING; POSTMAN, WILLIAM; TAYLOR, JAMES W.
- Book ID
- 120038580
- Publisher
- American Chemical Society
- Year
- 1960
- Tongue
- English
- Weight
- 795 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0022-3263
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AbstractΓReaction of 2-unsubstituted 1H-imidazole 3-oxides with isocyanates, isothiocyanates, and dimethyl acetylenedicarboxylate led to the formation of 2-functionalized imidazole derivatives. Stepwise reaction mechanisms via zwitterionic intermediates are proposed. The intermediate [312] cycloaddu
Reaction of benzimidazole-2(2@-thione 2 with dimethyl acetylenedicarboxylate (DMAD) has been reported by Grinblat and Postovskii to give the thiazolo[3,2-albenzimidazole 2.' On mechanistic grounds, however, condensation of i with DMAD can give rise to one or more of at least four products ,2, 2, 4~