申请人:Gao Hongjun
公开号:US20130012735A1
公开(公告)日:2013-01-10
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 brmobenzene 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 R
2
is (substituted) hydrocarbyl.
公开了公式(f)的西他列汀中间体化合物及其制备和使用方法。通过以下步骤制备公式(f)的化合物:将公式(a)的化合物经电亲合反应与苄卤化物反应,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,这些化合物是制备公式(g)的西他列汀中间体的新颖中间体。将公式(f)的化合物经Pd/C还原、脱苄基、保护基替换处理,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)烃基。