Stereospecific Displacement of 1-(Pyridinyl)ethanols with Amines and Thiols via Methanesulfonate Esters; Asymmetric Synthesis of 1-(Pyridinyl)ethylamines and Sulfides
Stereospecific Substitution of 1-(2-Pyridinyl)ethyl Methanesulfonate with S- and O-Nucleophiles
摘要:
Nucleophilic substitution reactions of (S)- and (R)-1-(2-pyridinyl)ethyl methanesulfonate with S- and O-nucleophiles are described. The reaction of S-nucelophiles, such as aryl- and alkylthiols, and thioacetic acid, gave substituted sulfide and thioacetate with inversion of the configurations. For the reaction of O-nucleophiles, sodium phenoxides gave aryl ethers in good yields stereospecifically, but sodium alkoxide gave complex mixtures including racemic alkyl ether. Reactions with sodium carboxylate afforded the corresponding ester stereospecifically.