Disclosed herein is a process for preparing a compound having the formula ##STR1## which comprises coupling a compound having the formula ##STR2## or a salt thereof, with a compound having the formula ##STR3## to obtain a compound having the formula ##STR4## reacting that compound with 2-aminooxy-2-methylpropanoic acid, or a salt thereof, to obtain a compound having the formula ##STR5## and, if R is an amino protecting group, deprotecting that compound to yield the desired product; wherein R is hydrogen or an amino protecting group; R.sub.1 is hydrogen, methyl or ethyl; M.sup..sym. is an inorganic cation or a substituted ammonium ion; and M.sub.1.sup..sym. is hydrogen, an inorganic cation or a substituted ammonium ion.
本文揭示了一种制备具有以下结构的化合物的方法:其中包括将具有以下结构的化合物或其盐与具有以下结构的化合物偶联,以获得具有以下结构的化合物,然后将该化合物与2-
氨氧基-2-甲基
丙酸或其盐反应,以获得具有以下结构的化合物,并且如果R是
氨基保护基,则去保护该化合物以得到所需的产物;其中R为氢或
氨基保护基;R.sub.1为氢、甲基或乙基;M.sup..sym.为无机阳离子或取代
铵离子;M.sub.1.sup..sym.为氢、无机阳离子或取代
铵离子。