申请人:Kankan Rajendra Narayanrao
公开号:US20100113804A1
公开(公告)日:2010-05-06
There is provided a process for preparing dorzolamide and processes for preparing intermediates useful in the preparation of dorzolamide. In particular, there is provided a process for preparing an acetoamido sulfone of formula (viii) comprising oxidation of a hydroxysulfonamide of formula (vii) in the presence of an oxidizing agent selected from the group consisting of: a peracid, tert-butyl hydroperoxide, dimethyl dioxirane, selenium dioxide, m-phenanthroline di-N-oxide, nitric acid and hydrogen peroxide. There is also provided a process for preparing an acetoamidosulfone of formula (ix-a) comprising converting a hydroxy sulfone of formula (viii) to the acetoamidosulfone of formula (ix-a) in the presence of acetonitrile and an acid. There is also provided a process for separating the cis- and trans-isomers of dorzolamide from a mixture of the trans-isomer of dorzolamide and the cis-isomer of dorzolamide comprising reacting the mixture of isomers with a carboxylic acid.
提供了一种制备多索胺的方法,以及用于制备多索胺的中间体的方法。特别地,提供了一种制备公式(viii)的乙酰胺磺酸酯的方法,包括在过氧化物、叔丁基过氧化氢、二甲基二氧兰、二氧化硒、m-菲啰啉二-N-氧化物、硝酸和过氧化氢中选取的氧化剂的存在下氧化公式(vii)的羟基磺酰胺。还提供了一种制备公式(ix-a)的乙酰胺磺酸酯的方法,包括在乙腈和酸的存在下将公式(viii)的羟基磺酸酯转化为公式(ix-a)的乙酰胺磺酸酯。此外还提供了一种从多索胺的顺式异构体和反式异构体的混合物中分离出顺式和反式异构体的方法,包括将异构体混合物与羧酸反应。