N-Boc-D-leucine N'-Methoxy-N'-MethylaMide

N-?[(1R)?-?1-?[(Methoxymethylamino?)?carbonyl]?-?3-?methylbutyl]?-carbamic Acid 1,?1-?Dimethylethyl Ester is an intermediate in synthesizing (R)-2-Amino-4-methyl-1-((S)-2-methyloxiran-2-yl)pentan-1-one Trifluoroacetate Salt (A605100), an impurity of carfilzomib (C183460). Carfilzomib is a second-generation proteasome inhibitor that is used as a treatment in relapsed and refractory multiple myeloma.