Synthesis of (+)-(S)-4-s.Butyl and (+)-(S)-2-Methyl-4-s.Butylpyridine

Abstract
In connection with our investigation1,2,3 on the synthesis of optically active alkylpyridines we needed an efficient route to mono- and disubstituted pyridines, having the chirality center directly bound to the carbon atom in the 4-position: