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:
Jan. 03, 1989
Filed:
Oct. 01, 1987
Applicant:
Inventors:
Takayoshi Yamauchi, Sakai, JP;
Kaneaki Hattori, Sakai, JP;
Shunichi Ikeda, Sakai, JP;
Kentaro Tamaki, Sakai, JP;
Assignee:
Kyowa Hakko Kogyo Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
568 27 ; 568 38 ; 568 56 ;
Abstract
Novel cyclopentane derivatives which are useful as an intermediate for the preparation of N-(L-aspartyl)-N'-(2,2,5,5-tetramethylcyclopetanecarbonyl)-R-1,1-diaminoet hane are represented by the formula (I) ##STR1## wherein R.sub.1 is hydrogen and R.sub.2 is cyano, formyl, carbamoyl, alkanesulfonyloxy, or ##STR2## wherein R.sub.3 and R.sub.4 are the same or different and represent alkyl, substituted alkyl or R.sub.1 and R.sub.2 are combined to be methylsulfinylmethylene, acetoxymethylthiomethylene, halomethylthiomethylene, methylthiomethylene, alkoxymethylene, or --CH.sub.2 --O--.