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Novel Synthesis of Highly Functionalized Pyrazolines and Pyrazoles by Triphenylphosphine-Mediated Reaction of Dialkyl Azodicarboxylate with Allenic Esters.

โœ Scribed by Vijay Nair; A. T. Biju; Kishor Mohanan; Eringathodi Suresh


Publisher
John Wiley and Sons
Year
2006
Weight
25 KB
Volume
37
Category
Article
ISSN
0931-7597

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One-Pot Synthesis of Functionalized 2H-C
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## Abstract An effective route to functionalized 2__H__โ€chromene (=2__H__โ€1โ€benzopyran) derivatives 4 is described (__Schemeโ€…1__). This involves the reaction of a 1,1โ€diactivated alkene, resulting from the reaction of dimedone (=5,5โ€dimethylcyclohexaneโ€1,3โ€dione; 1a) with methyl chloroglyoxylate (C