The present invention concerns an improved process for the preparation of asymmetric cyclic ureas as well as intermediates in the preparation of asymmetric cyclic ureas. In the process, a diamine of formula (I-a)
1
is selectively monoacylated to give an asymmetric monoacylated diamine which can be converted into asymmetric intermediates. The asymmetric intermediates can be further alkylated, cyclized, and/or modified to give compounds which are useful as HIV protease inhibitors for the treatment of HIV infection. The invention allows for scalable preparation of a wide variety of asymmetrical cyclic ureas.
本发明涉及一种制备不对称环状
脲的改进工艺以及制备不对称环状
脲的中间体。在该工艺中,式(I-a)的二胺
1
进行选择性单乙酰化,得到不对称单乙酰化二胺,该二胺可转化为不对称中间体。不对称中间体可进一步烷基化、环化和/或修饰,得到可用作治疗 HIV 感染的 HIV 蛋白酶抑制剂的化合物。本发明可规模化制备多种不对称环状
脲。