Ring closure reactions O 0130Reactions of Alkyl 2-Benzylidene-2-polyfluoroacylacetates with N,N-Dinucleophiles. -Title compounds (I) act as typical vinyl ketones adding dinucleophiles to the C-C double bond and keto group. However, it is difficult to handle the 2-benzylidene-3-oxoalkanoates (I) because of their easy cleavage followed by condensation of fluoroacyl ester and benzaldehyde with diamines like anhydrous hydrazine or o-phenylenediamine. -(PRYADEINA, M. V.; BURGART, Y. V.; KODESS, M. I.; SALOUTIN*, V. I.; CHUPAKHIN, O. N.; Russ.
Fused pyrimidine derivatives R 0515 Synthesis of Substituted Pyrido[1,2-a]pyrimidines from 2-Arylmethylidene--3-fluoroalkyl-3-oxopropionates. -Cyclocondensation of 2-arylidene-3-oxopropionates (I) with 2-aminopyridine proceeds not regioselective and affords two types of pyridopyrimidines (III) and/or (IV). Both pyridopyrimidines form complexes with transition metal ions, e.g. copper(II) acetate. -(PRYADEINA, M. V.; BURGART, Y. V.; KODESS, M. I.; SALOUTIN*, V. I.; Russ.
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