In order to investigate whether γ-amino β-keto esters can undergo Hantzsch type reaction to give desired 1,4-dihydropyridine derivatives, we have synthesized various ethyl esters of γamino β-keto amino acids from of N-protected amino aldehydes in the presence of ethyl diazoacetate and tin chloride (20 mol %) as a catalyst in DCM, shown in Scheme 1, as per the protocol reported by our group earlier. All the N-protected γ-amino β-keto esters were purified through silica column chromatography in good yields before using it for the next step.