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Synthesis of N-alkyl urea hydroxamic acids. The letters in the scheme represent the following solvents: a, NsCl, aqueous NaHCO3, DCM; b, R1OH, DIAD, PPh3; c, PhSH, TBDE-PS, DMF; d, COCl2, aqueous NaHCO3, Et2O; e, l-Pro-OtBu, pyridine, DCM; f, TFA, DCM; g, R2NH2, PyBop, DIEA, DMF; and h, aqueous NH2OH, dioxane.
