Conversion of N-Acyl-2,3-dihydro-4-pyridones to 4-Chloro-1,2-dihydropyridines Using the Vilsmeier Reagent. Synthesis of (-)-Coniine and (+/-)-Lupinine

Article abstract of DOI:10.1021/jo00079a018

The full details are given of a study on the conversion of dihydropyridones of the type 3 to 4-chloro-1,2-dihydropyridines 4 using a Vilsmeier reagent.The use of 1 equiv of Vilsmeier reagent under mild conditions (ClCHCCl2, rt) transformed several racemic