The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1998
Filed:
May. 20, 1996
Yoshiaki Oda, Toyonaka, JP;
Kazunori Iwakura, Takatsuki, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
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 �I!: ##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 �IV!: ##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.