PRODUCTION METHOD FOR 3,3-DIMETHYL-3,4-DIHYDRO-1H-QUINOXALIN-2-ONE DERIVATIVE AND INTERMEDIATE FOR SAID PRODUCTION METHOD
申请人:SANTEN PHARMACEUTICAL CO., LTD.
公开号:US20160200690A1
公开(公告)日:2016-07-14
An object 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 R
1
represents a hydrogen atom, an optionally substituted alkyl group, an optionally substituted cycloalkyl group, or an optionally substituted aryl group, R
2
represents a hydrogen atom, an optionally substituted alkyl group, a hydroxy group, or nitrogen atom-protecting group, R
3
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 R
1
, R
2
, and X are the same as defined in formula (1), R
4
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 R
1
, R
2
, R
4
, 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.
提供一种适用于3,3-二甲基-3,4-二氢-1H-喹喔啉-2-酮衍生物的工业生产的新型生产方法和该方法的合成中间体的目的是提供一种生产化合物的方法,该化合物由下式表示:其中R1代表氢原子、可选择地取代的烷基基团、可选择地取代的环烷基基团或可选择地取代的芳基基团,R2代表氢原子、可选择地取代的烷基基团、羟基或氮原子保护基团,R3代表氢原子、可选择地取代的烷基基团、羟基或氮原子保护基团,X代表羟基或脱离基,或其盐,所述方法包括以下步骤:将由下式表示的化合物与硝化剂反应以获得由下式表示的化合物,其中R1、R2和X如式(1)定义的相同,R4代表可选择地取代的烷基基团、可选择地取代的环烷基基团或可选择地取代的芳基基团,或其盐,还原由下式表示的化合物或其盐以获得由下式表示的化合物或其盐。