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A series of α-aminocarbonitriles 2a–h, obtained by a condensation reaction of 4-hydroxycoumarin with malononitrile and a series of arylaldehydes, was reacted with Lawesson’s reagent to give the diazaphosphinanes 3a–h and 3a′–h′ as diastereoisomers. All the synthesized compounds were characterized by spectroscopic means such as NMR (1H, 13C, 31P) and MS. The synthesized compounds were evaluated for...