申请人:Sumitomo Chemical Company, Limited
公开号:US05739387A1
公开(公告)日:1998-04-14
Racemic or optically active threo-3-(3,4-dihydroxyphenyl)serine can be readily produced via a few short steps by a process involving the steps of reacting a racemic or optically active N-acyl DOPA derivative represented by the formula \x9bI!: ##STR1## wherein X is a halogen atom; n is 0, 1, 2 or 3; R.sup.1 and R.sup.2 independently represent a protecting group for a hydroxyl group; R.sup.3 is a protecting group for carboxyl group; R.sup.4 is an alkyl group which may have a substituent or a phenyl group which may have a substituent; and a carbon marked with the symbol * is an asymmetric carbon, with a halogen radical generator, a cerium (IV) salt, or a persulfate salt in the presence of a copper catalyst to produce racemic or optically active oxazolines represented by the formula \x9bIV!: ##STR2## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, X, n and * are as defined above; and thereafter conducting an oxazoline ring opening and removing R.sup.1, R.sup.2 and R.sup.3 and, optionally, removing X when n is 1, 2 or 3.
通过涉及以下步骤的过程,可以通过几个简短的步骤轻松地生产外消旋或光学活性的threo-3-(3,4-二羟基苯基)丝氨酸:通过将由以下公式表示的外消旋或光学活性N-酰基DOPA衍生物与卤素原子X; n为0、1、2或3; R1和R2分别表示羟基的保护基; R3是羧基的保护基; R4是可能具有取代基的烷基或可能具有取代基的苯基; 以及标有符号*的碳是不对称碳的碳进行反应,与卤素自由基发生剂、四价铈盐或过硫酸盐在铜催化剂存在下反应,以产生由以下公式表示的外消旋或光学活性的噁唑啉:其中R1、R2、R3、R4、X、n和*如上定义; 然后进行噁唑啉环开启并去除R1、R2和R3,可选地,在n为1、2或3时去除X。