The present disclosure provides processes for preparing a compound of formula (I) from a compound of formula (II) via two steps: 6a) contacting 2-(aminooxy)ethanol (i.e., formula (K)) or a salt thereof (e.g., formula (K-1)), with a base and a silylating agent to form a first mixture including an O-silyl protected compound of formula (K); and 6b) adding a second mixture including a compound of formula (II) or a salt therefore, to the first mixture of step 6a) to form the compound represented by formula (I): The present processes only utilize less than 1.5 equivalents of 2-(aminooxy)ethanol or the salt thereof relative to the compound of formula (II), and therefore reduce the burden to remove excess 2-(aminooxy)ethanol on a large manufacturing scale. Also provided are processes for preparing the compound of formula (K) or (K-1).
本公开提供了从式(II)化合物通过两步制备式(I)化合物的过程:6a)将2-(
氨氧基)
乙醇(即式(K))或其盐(例如式(K-1))与碱和
硅基化试剂接触,形成包含式(K)的O-
硅保护化合物的第一混合物;6b)将包含式(II)化合物或其盐的第二混合物添加到步骤6a)中的第一混合物中,以形成由式(I)表示的化合物:本过程仅使用小于1.5当量的2-(
氨氧基)
乙醇或其盐相对于式(II)化合物,因此减少了在大规模制造中去除多余2-(
氨氧基)
乙醇的负担。还提供了制备式(K)或(K-1)化合物的过程。