((S)-1-Formyl-1-methyl-2-trityloxy-ethyl)-carbamic acid benzyl ester

benzyl [(1R,2E)-1-methyl-1-[(trityloxy)methyl]but-2-en-1-yl] carbamate

methyl (S)-4-methyl-2-oxooxazolidine-4-carboxylate

diethyl 2-(benzyloxycarbonylamino)-2-methylmalonate