Heterocycles Starting from Bis(alkoxycarbonyl)ketene Ethylene Acetals (=Dialkyl 2-(1,3-Dioxolan-2-ylidene)propane-1,3-dioate). Synthesis and Properties of a New Class of Pyrazolium Betaines

DOI: 10.1002/hlca.19920750407

Source and publish data:

Helvetica Chimica Acta p. 1039 - 1051 (1992)

Update date:2022-07-30

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Authors:

Neidlein, Richard

Schroeder, Guenter

Krieger, Claus

Kikelj, Danijel

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Article abstract of DOI:10.1002/hlca.19920750407

The readily available bis(alkoxycarbonyl)ketene ethylene acetals 1 react with bifunctional nucleophiles to give heterocycles 2-5 (Scheme 1).Their reactions with N,N-dialkylhydrazines lead to the pyrazolium betaines 7a-f (Scheme 4).Cyclic N,N-dialkylhydraz

Full text of DOI:10.1002/hlca.19920750407

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