S. Bohm et al., PREPARATION AND SPECTROSCOPIC PROPERTIES OF SPIROCYCLIC 1-METHYL-2,4,4,6-TETRAARYL-1,4-DIHYDROPYRIDINES, Collection of Czechoslovak Chemical Communications, 59(5), 1994, pp. 1105-1114
1,5-Diones Ib - Ie were converted to spirocyclic 1,4-dihydropyridines
IIb - IIe by treatment with methanolic methylamine. The starting diket
ones Ib - Ie were obtained from corresponding acetophenones 4-X-C6H4CO
Me and fluorenone with sodium amide except of If where only ketone III
and 1,4-dione IV were isolated. Molecular spectra (UV-VIS, NMR, IR an
d MS) of compounds Ib - Ie, IIa - IIe, III, and IV were assigned and i
nterpreted,