## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v
Tandem aza-wittig reaction/electrocyclic ring-closure a facile entry to the synthesis of fused pyrimidines: Preparation of pyrazolo[3,4-d] and 1,2,3-triazolo[4,5-d]pyrimidine derivatives.
✍ Scribed by Pedro Molina; Antonio Arques; Ma Victoria Vinader; Jan Becher; Klaus Brondum
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- French
- Weight
- 212 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
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## Abstract magnified image __E__‐3‐(__N,N__‐Dimethylamino)‐1‐(3‐methylthiazolo[3,2‐__a__]benzimidazol‐2‐yl)prop‐2‐en‐1‐one (**2**) was synthesized by the reaction of 1‐(3‐methylthiazolo[3,2‐__a__]benzimidazol‐2‐yl)ethanone (**1**) with dimethylformamide‐dimethylacetal. The reaction of **2** with
## Abstract magnified image The carbodiimides **2**, obtained from reactions of iminophosphorane **1** with isocyanates, reacted with hydrazine to give selectively 3‐amino‐2‐arylaminobenzothieno[3,2‐__d__]pyrimidin‐4(3__H__)‐ones **4**. Reactions of **4** with triphenylphosphine, hexachloroethane,