PRODUCTION METHOD FOR 3, 3-DIMETHYL-3, 4-DIHYDRO-1H-QUINOXALINE-2-ONE DERIVATIVE AND INTERMEDIATE FOR SAID PRODUCTION METHOD
申请人:Santen Pharmaceutical Co., Ltd
公开号:EP3031802A1
公开(公告)日:2016-06-15
An obj ect is to provide a novel production method suitable for industrial production of a 3,3-dimethyl-3,4-dihydro-1H-quinoxalin-2-one derivative and a synthetic intermediate for the method. Provided is a method for producing a compound represented by formula (1):
wherein R1 represents a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, or an optionally substituted aryl group, R2 represents a hydrogen atom, an optionally substituted alkyl group, a hydroxy group, or a nitrogen atom-protecting group, R3 represents a hydrogen atom, an optionally substituted alkyl group, a hydroxy group, or a nitrogen atom-protecting group, and X represents a hydroxy group or a leaving group,
or a salt thereof, the method comprising the steps of:
reacting a compound represented by formula (2):
wherein R1, R2, and X are the same as defined in formula (1), R4 represents an optionally substituted alkyl group, an optionally substituted cycloalkyl group, or an optionally substituted aryl group,
or a salt thereof with a nitrating agent to obtain a compound represented by formula (3):
wherein R1, R2, R4, and X are the same as defined in formulae (1) and (2),
or a salt thereof, and
reducing the compound represented by formula (3) or the salt thereof to obtain the compound represented by formula (1) or the salt thereof.
目的是提供一种适用于工业化生产 3,3-二甲基-3,4-二氢-1H-
喹喔啉-2-酮衍
生物的新型生产方法和用于该方法的合成中间体。本发明提供了一种生产由式(1)代表的化合物的方法:
其中 R1 代表氢原子、任选取代的烷基、任选取代的环烷基或任选取代的芳基,R2 代表氢原子、任选取代的烷基、羟基或氮原子保护基团,R3 代表氢原子、任选取代的烷基、羟基或氮原子保护基团,X 代表羟基或离去基团、
或其盐,该方法包括以下步骤
使式(2)代表的化合物反应:
其中 R1、R2 和 X 与式 (1) 中定义的相同,R4 代表任选取代的烷基、任选取代的环烷基或任选取代的芳基、
或其与硝化剂的盐,以获得式(3)所代表的化合物:
其中 R1、R2、R4 和 X 与式 (1) 和 (2) 所定义的相同、
或其盐,以及
还原式(3)代表的化合物或其盐,得到式(1)代表的化合物或其盐。