Sitagliptin intermediate compounds of formula (f) and methods of preparation and use thereof are disclosed. Compounds of formula (f) are prepared by the following steps: compounds of formula (a) are subjected to electrophilic reaction with benzyl halides to form compounds of formula (b), which then react with compounds of formula (i) to form novel compounds of formula (e). Gignard agents formed from 2,4,5-trifluoro bromobenzene and magnesium metal react with compounds of formula (e) to afford compounds of formula (f), which are novel intermediates for the preparation of Sitagliptin intermediates of formula (g). Compounds of formula (f) are subjected to reduction by Pd/C, debenzylation, substitution of protecting group to form compounds of formula (g). Compounds of formula (a), (b), (i), (e), (f), and (g) have the following structures, in which R is protecting group of carboxyl and R2 is (substituted) hydrocarbyl.
本文介绍了公式(f)的
西格列汀中间化合物的制备和使用方法。公式(f)的化合物是通过以下步骤制备的:将公式(a)的化合物与苄基卤化物进行亲电反应,形成公式(b)的化合物,然后与公式(i)的化合物反应,形成新的公式(e)的化合物。由
2,4,5-三氟溴苯和
镁金属形成的
格氏试剂与公式(e)的化合物反应,得到公式(f)的化合物,这是制备公式(g)的
西格列汀中间体的新型中间体。将公式(f)的化合物经过Pd/C还原、去苄基化、保护基的取代,形成公式(g)的化合物。公式(a)、(b)、(i)、(e)、(f)和(g)的化合物具有以下结构,其中R是羧基的保护基,R2是(取代)的烃基。