6'-(hydroxymethyl)-7'-(1-oxo-1-(piperidin-1-yl)butan-2-yl)-2'H-spiro[[1,3]dioxolane-2,1'-indolizin]-5'(3'H)-one

ethyl 5'-oxo-7'-(1-oxo-1-(piperidin-1-yl)butan-2-yl)-3',5'-dihydro-2'H-spiro[[1,3]dioxolane-2,1'-indolizine]-6'-carboxylate

4-ethyl-8-methoxy-6-(trimethylsilyl)-1H-pyrano[3,4-c]pyridine

(S)-(+)-4-ethyl-4-hydroxy-8-methoxy-6-(trimethylsilyl)-1,4-dihydro-3H-pyrano[3,4-c]pyridin-3-one

methyl 3-methylquinoline-2-carboxylate