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Beilstein J. Org. Chem. 2020, 16, 445–450, doi:10.3762/bjoc.16.41
Graphical Abstract
Figure 1: The structures of 5-fluorouracil (1), 5-fluorocytosine (2), emtricitabine (3) and capecitabine (4).
Scheme 1: Synthesis of potassium (Z)-2-cyano-2-fluoroethenolate (8) by Dietz et al. [36].
Scheme 2: Scope of the cyclization reaction. All yields are those of the purified products. aNo further purif...
Scheme 3: Cyclization with phenylhydrazine (12a) to obtain the desired pyrazole 13a and the byproducts 13b an...