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:
May. 16, 1995
Filed:
Sep. 05, 1991
Applicant:
Inventors:
Yoshihito Abe, Koriyama, JP;
Akio Hashimoto, Koriyama, JP;
Takeshi Nagasawa, Urawa, JP;
Katsumasa Kuroiwa, Koriyama, JP;
Assignee:
Nitto Boseki Co., Ltd., Fukushima, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564240 ;
Abstract
Novel N.sup.G -protected or unprotected-L-argininal-dibutyl acetals (I) can be prepared from L-argininal derivatives (III) merely by reacting in an azeotropic solvent in the presence of p-toluenesulfonic acid. In the products (I), L-form amounts to more than 99%, without further optical resolution. The L-argininal acetals (I) are useful as starting materials for preparing peptidyl-L-argininal derivatives which can provide protease inhibitors or ligands used for affinity chromatography of various proteases.