The invention provides a process of preparing an intermediate useful in the synthesis of biphenyl-2-ylcarbamic acid l-(2-[4-(4-carbamoylpiperidin-l-ylmethyl) benzoyl]methylamino}ethyl)piperidin-4-yl ester, and a process of preparing a crystalline freebase of the ester.
该发明提供了一种制备中间体的方法,该中间体在双苯基-2-基
氨甲酸l-(2-[4-(4-
氨甲酰
哌啶-1-基甲基)苯甲酰]甲基
氨基}乙基)
哌啶-4-基酯的合成中有用,并提供了制备该酯的晶体游离碱的方法。