1-(tert-Butyl) 3-ethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1,3(2H)-dicarboxylate

for the following products 1,3(2H)-pyridinedicarboxylic acid, 5,6-dihydro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-, 1-(1,1-dimethylethyl) 3-ethyl ester and 1-(tert-Butyl) 3-ethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1,3(2H)-dicarboxylate