R. Hamilton et al., A CONVENIENT SYNTHESIS OF N-PROTECTED DIPHENYL PHOSPHONATE ESTER ANALOGS OF ORNITHINE, LYSINE AND HOMOLYSINE, Tetrahedron letters, 34(17), 1993, pp. 2847-2850
A 3-step synthesis to the title compounds has been developed which pro
vides them differentially protected at nitrogen. These could then be s
electively deprotected using hydrazine hydrate or hydrogenolysis over
Pd/C.