Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Benzyltin reagents undergo highly regio- and chemo-selective γ-addition to a variety of -acylpyridinium salts to give4-benzyl-1,4-dihydropyridines exclusively in good yields. ... All new compounds gave consistent spectral data (mass, IR, 1 H- and 13 C-NMR) with the proposed structures.