The preparation of 1,2,4-triazines from α,β-diketo-ester equivalents and their application in pyridine synthesis

The α-Chloro-α-acetoxy-β-keto-esters were prepared from β-keto-esters in good overall yields. These compounds reacted as α,β-diketo-ester equivalents with amidrazones yielding triazines, generally in good yields, or with an amidrazone and 2,5-norbornadiene in a one-pot aza Diels–Alder reaction to give the corresponding pyridines.