H. Groger et al., SYNTHETIC APPROACH TO NEW ALPHA-AMINOPHOSPHONATES DERIVED FROM 6-MEMBERED, SULFUR-CONTAINING HETEROCYCLIC IMINES, Phosphorus, sulfur and silicon and the related elements, 116, 1996, pp. 123-132
Dialkyl phosphite adds to the C=N bond in 2H-1,3-thiazines 4 to give a
lpha-aminophosphonic acid esters 6. Starting from 2H-1,4-benzothiazine
s 5, the corresponding phosphonic acid esters 7 were obtained. For the
first time C2-chiral 2H-1,3-thiazines 4a and 4b were used to investig
ate the diastereoselectivity of the addition reaction of dialkyl phosp
hite to those imine compounds.