Stereospecific intramolecular cyclization of diethyl (R)-2-(N-benzylidene)-aminobutyl phosphite into (3R,5R)-2-ethoxy-2-oxo-3-phenyl-5-ethyl-1,4,2-oxazaphosphorinane in the presence of hydrogen chloride
aA. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Centre of the Russian Academy of Sciences, 420088 Kazan, Russian Federation