1999 organo-phosphorus compounds, isocyclic C derivatives

organo-phosphorus compounds, isocyclic C derivativesS 0084

34 - 199A Facile Synthesis of Diastereoisomeric 1,4-Diionic Organophospho-rus Compounds. — Addition of acetylenedicarboxylates (III) to strongCH-acids [Meldrum’s acid (I) or dimethylbarbituric acid (VI)] in the presenceof triphenylphosphine provides access to highly functionalized 1,4-diionicorganophosphorus compounds in high yields. The betaines are obtained as amixture of diastereomers with a preference to the anti-isomer. — (YAVARI,ISSA; ISLAMI, MOHAMMAD REZA; BIJANZADEH, HAMID REZA; Tetra-hedron 55 (1999) 17, 5547-5554; Dep. Chem., Univ. Tarbiat Modarres, Tehran,Iran; EN)

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