Disclosed is an enantioselective process for the preparation of letermovir of formula (I) which comprises enantioselective addition of (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)ethanone (IV), catalysed by TiCl4 on the imine of formula III, to give intermediate V, which is hydrolysed to the acid of formula VI and subsequently cyclised in the presence of organic bases to give intermediate VII, from which letermovir is obtained with good yields and a high degree of enantioselection.
披露了一种用于制备
化学式(I)的乐特莫韦的对映选择性过程,其中包括在公式III的
亚胺上由TiCl4催化的(S)-1-(4-苄基-2-
硫代
噻唑啉-3-基)乙酮(IV)的对映选择性加成,得到中间体V,将其
水解为
化学式VI的酸,随后在有机碱的存在下环化,得到中间体VII,从中可以得到乐特莫韦,其产率高且对映选择性高。