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Paper | Regular issue | Vol 51, No. 9, 1999, pp.2073-2078
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8563
Reaction of rel-(4R,5R)-4-Benzoylamino-5-phenyl-3-pyrazolidinone with Aliphatic 1,3-Dicarbonyl Compounds. A ’Ring Switch’ Synthesis of rel-(2R,3R)-3-Phenyl-3-(pyrazolyl-1)alanine Esters

Jurij Svete and Branko Stanovnik*

*Faculty of Chemistry and Chemical Technology, University of Ljubljana, Askerceva 5, P.O. Box 537, SLO-1000 Ljubljana, Slovenia


rel-(2R,3R)-N-Benzoyl-3-phenyl-3-(pyrazolyl-1)alanine esters (5-8) were prepared by acid-catalysed treatment of rel-(4R,5R)-4-benzoylamino-5-phenyl-3-pyrazolidinone (1) with various aliphatic 1,3-dicarbonyl compounds (2-4).