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:
Jul. 02, 2002
Filed:
Aug. 18, 2000
Lawrence Joseph Wilson, Mason, OH (US);
David Edward Portlock, Maineville, OH (US);
Min Li, West Chester, OH (US);
The Procter & Gamble Co., Cincinnati, OH (US);
Abstract
The subject invention involves processes for making 1-aminohydantoin compounds using a solid support resin, comprising the following steps; (a) preparing a resin-bound protected &agr;-hydrazinyl ester; (1) by reacting the resin with an &agr;-bromo carboxylic acid, then with a protected hydrazine; or (2) by reacting the resin with a protected &agr;-hydrazinyl carboxylic acid; (b) preparing a resin-bound imine by removing the blocking group from the hydrazinyl moiety, then reacting the unprotected hydrazinyl moiety with an aldehyde or ketone; (c) preparing a resin-bound secondary urea: (1) by reacting the imine with p-nitrophenylchloroformate or trisphosgene, then with a primary amine; or (2) by reacting the imine with an isocyanate, and (d) preparing the 1-aminohydantoin compound by removing the secondary urea from the resin and cyclizing it.