反应详情

A mixture of 59.1 g. (0.316 mole) of 3-phenylthiopyridine, 14.7 g. (0.318 mole) of sodium amide and 84 gms. of dimethyl aniline is heated at 150°-160° C for 6 hours. After dilution with 100 ml. of water, the reaction mixture is extracted with chloroform. The combined extracts are washed with water and dried. Evaporation of the solvent in vacuo yields an oily residue. The residue is triturated with three 100 ml. portions of petroleum ether yielding 17 gm. of crude insoluble product. Proton magnetic resonance spectroscopy indicates the material is a 50/50 mixture of 2- and 6-amino derivatives. The isomers are separated on silica gel eluted with 10% ethylacetate 90% methylene chloride affording pure 2-amino 3-(phenylthio) pyridine, m.p. 108° -109° C.

1. additionA mixture of 59.1 g
2. extractionof water, the reaction mixture is extracted with chloroform
3. washThe combined extracts are washed with water
4. customdried
5. customEvaporation of the solvent in vacuo
6. customyields an oily residue
7. customThe residue is triturated with three 100 ml
8. additiona 50/50 mixture of 2- and 6-amino derivatives
9. customThe isomers are separated on silica gel
10. washeluted with 10% ethylacetate 90% methylene chloride affording pure 2-amino 3-(phenylthio) pyridine, m.p. 108° -109° C.