H. Singh et al., CARBON-TRANSFER REACTIONS WITH HETEROCYCLES .7. A FACILE SYNTHESIS OFUNSYMMETRICALLY SUBSTITUTED 1,4-DIHYDROPYRIDINES, Journal of chemical research. Synopses, (3), 1993, pp. 120-121
The title compounds, analogues of nifedipine, are conveniently formed
by transfer of the C-2 units from 1,3-oxazinanes to a mixture of ethyl
beta-aminocrotonate and methyl acetoacetate or dimedone.