Scheme 2.
Preparation of α‐aminophosphonic acids (R)‐(+)‐3 and (S)‐(−)‐3 with absolute configuration assignment by the X‐ray method. Reaction conditions: a) Me2NH, H2O2; b) TMSBr, allylTMS; c) H2O; d) HCl, dioxane; e) 4‐BrC6H4NCO, pyridine.
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