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:
Mar. 08, 1994
Filed:
Dec. 15, 1992
Chikara Kaneko, Sendai, JP;
Masayuki Sato, Sendai, JP;
Chisso Corporation, Osaka, JP;
Abstract
There are provided novel and optically active 2,2-dimethyl-1,3-dioxin-4-ones which are useful as starting materials for physiologically active compounds, functional materials or the like. Provided are optically active 5,6-epoxyhexanoic acid esters and novel optically active 6-substituted tetrahydropyran-2-one derivatives. That is, optically active 6-chloromethyltetrahydropyran-2-one can be synthesized by lactonizing optically active 2,2-dimethyl-6-(3-chloro-2-hydroxypropyl)-1,3-dioxin-4-one to form optically active 6-chloromethyltetrahydropyran-2,4-dione; reacting the thus formed compound with hydrogen in the presence of a catalyst to obtain optically active 6-chloromethyl-4-hydroxytetrahydropyran-2-one; subjecting this compound to a dehydration reaction, thereby obtaining optically active 6-chloromethyldihydropyran-2-one; reacting this compound with hydrogen in the presence of a catalyst to form optically active 6-chloromethyltetrahydropyran-2-one; and then treating this compound under basic conditions to prepare an optically active 5,6-epoxyhexanoic acid ester represented by the formula (6) ##STR1## (wherein the symbol * represents an asymmetric carbon atom, and R is a methyl group or an ethyl group).