METHOD FOR PREPARING PHENYLALANINE DERIVATIVES HAVING QUINAZOLINE-DIONE SKELETON AND INTERMEDIATES FOR USE IN THE PREPARATION OF THE DERIVATIVES
申请人:KATAOKA Noriyasu
公开号:US20110313154A1
公开(公告)日:2011-12-22
A method for preparing a phenylalanine derivative having a quinazoline-dione ring represented by the following formula (1) or a pharmaceutically acceptable salt thereof, comprising the following steps (a), (b) and (c):
(a) reacting an acyl phenylalanine derivative represented by the following formula (2):
with a carbonyl group-introducing reagent and a specific anthranilic acid derivative to thus form the corresponding carboxy-asymmetric urea derivative;
(b) converting the carboxy-asymmetric urea derivative into the corresponding quinazoline-dione derivative in the presence of a carboxyl group-activating agent:
(c) if desired, substituting an N-alkyl group for the hydrogen atom bonded to the nitrogen atom present in the quinazoline-dione ring of the quinazoline-dione derivative using an N-alkylation agent and then deprotecting the resulting product, when the substituent R3′ which is a group corresponding to R3 is protected. According to this method, there can be obtained a phenylalanine derivative having a quinazoline-dione skeleton in a industrially favorably high yield.
一种制备具有喹唑啉二酮环的苯丙氨酸衍生物或其药学上可接受的盐的方法,其表示为以下公式(1),包括以下步骤(a)、(b)和(c):
(a)将以下公式(2)所表示的酰基苯丙氨酸衍生物与羰基引入试剂和特定的蒽酰氨基酸衍生物反应,从而形成相应的羧基不对称脲衍生物;
(b)在羧基活化剂的存在下,将羧基不对称脲衍生物转化为相应的喹唑啉二酮衍生物;
(c)如果需要,当保护基R3'对应于R3的基团受保护时,使用N-烷基化试剂将连接在喹唑啉二酮环中氮原子上的氢原子取代为N-烷基基团,然后去保护所得产物。通过该方法,可以在工业上获得具有喹唑啉二酮骨架的苯丙氨酸衍生物,且收率高。