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• W2037528755 abstract "A series of N-arylhexahydropyrimidines la-1 were synthesized by condensation of N-aryl-N'-alkyl- (or aryl)-1,3-propanediamines 2a-h with aldehydes. Reactions with formaldehyde proceeded in hydroalcoholic solution, while condensation with aromatic aldehydes required in general the use of activated molecular sieves. 1H NMR spectra of compounds la-1 were analyzed and the results correlated with their conforma-tional features. Derivatives devoid of a 2-substituent la-g show fast ring reversal and N-inversion. The presence of a 2-aryl group shifts the ring reversal equilibrium towards conformations where the 2-aryl substituent is equatorial. Differential assignment of axial and equatorial hydrogens in these compounds was made on the basis of coupling constants and chemical shift values. In compound 1k spectral data suggest the axial orientation of the N-methyl group. Such findings were confirmed in the corresponding NOESY spectrum." @default.
• W2037528755 created "2016-06-24" @default.
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• W2037528755 date "2002-07-01" @default.
• W2037528755 modified "2023-10-17" @default.
• W2037528755 title "<i>N</i>-arylhexahydropyrimidines. Part 1. Synthesis and¹H NMR characterization of 1,3-Di and 1,2,3-trisubstituted derivatives" @default.
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• W2037528755 doi "https://doi.org/10.1002/jhet.5570390409" @default.
• W2037528755 hasPublicationYear "2002" @default.
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