Ar. Maguire et al., SINGLE-STEP STEREOSPECIFIC TRANSFORMATION OF 2-PHENYLTHIO SECONDARY AMIDES INTO (Z)-3-CHLORO-2-PHENYLTHIO ACRYLAMIDES, Tetrahedron letters, 36(3), 1995, pp. 467-470
alpha-Phenylthio secondary propanamides la-e are converted stereospeci
fically on treatment with NCS to the analogus (%)-alpha-phenylthio-bet
a-chloro propenamides 2a-e. Extension to longer chain secondary amide
derivatives. 1f-g is also possible, albeit less efficiently and withou
t any appreciable stereoselectivity.