for the following products
(4R,6R)-6-(2-Aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetic acid 1,1-dimethylethyl ester | (4R,cis)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate | (4R-cis)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate and (4R,6R)-tert-Butyl-6-(2-aminoethyl)-2,2-dimethyl-1,3-dioxane-4-acetate