Enantioselective Synthesis of ε-Lactones by Lipase-Catalyzed Resolution
摘要:
Synthesis of optically active e-dodecalactone (1) by lipase-catalyzed enantioselective acylation with racemic N-alkyl-6-hydroxydodecanamide (rac-2) as a substrate was attempted. Lipase PS-catalyzed acetylation using rac-2 progressed efficiently, and both enantiomers of 1 were obtained with over 90% optical purities.
INFANT FORMULA CONTAINING AN AROMA COMPOSITION FOR USE AS FRAGRANCE
申请人:Büttner Andrea
公开号:US20100129312A1
公开(公告)日:2010-05-27
The invention relates to a nutraceutical composition such as infant formula or infant food comprising a) a defined aroma composition; b) a methodology for developing, maintaining certain aroma constituents in the infant formula and an aroma or fragrance composition to be used to increase the acceptance of a person or an object by the baby or new born.
A catalytic amount of TEMPO in the presence of PhI(OAc)2 effected oxidative lactonization of 1,6- and 1,7-diols, directly affording seven- and eight-membered lactones, respectively, in good yields.
The lactonization of hydroxy esters was performed over hydrous zirconium(IV) oxide modified by trimethylsilyl chloride. In the case of both primary and secondary hydroxy esters, lactones were obtained in high yield. In addition, it was elucidated that modified-hydrous zirconium(IV) oxide is superior to hydrous zirconium(IV) oxide regarding selectivity in lactonization.
The development of 1,5-dimethyl-9-azanoradamantane N-oxyl (DMN-AZADO; 1,5-dimethyl-Nor-AZADO, 2) as an efficient catalyst for the selective oxidation of primary alcohols in the presence of secondary alcohols is described. The compact and rigid structure of the azanoradamantane nucleus confers potent catalytic ability to DMN-AZADO (2). A variety of hindered primary alcohols such as neopentyl primary
9-azanoradamantane N—oxyl compound and method for producing same, and organic oxidation catalyst and method for oxidizing alcohols using 9-azanoradamantane N—oxyl compound
申请人:TOHOKU UNIVERSITY
公开号:US09114390B2
公开(公告)日:2015-08-25
An organocatalyst for oxidizing alcohols in which a primary alcohol is selectively oxidized in a polyol substrate having a plurality of alcohols under environmentally-friendly conditions. The organic oxidation catalyst has an oxygen atom bonded to a nitrogen atom of an azanoradamantane skeleton and at least one alkyl group at positions 1 and 5. The oxidation catalyst has higher activity than TEMPO, which is an existing oxidation catalyst, in the selective oxidation reaction of primary alcohols, and better selectivity than AZADO and 1-Me-AZADO. This DMN-AZADO can be applied to the selective oxidation reaction of primary alcohols that contributes to shortening the synthesizing process for pharmaceuticals, pharmaceutical raw materials, agricultural chemicals, cosmetics, organic materials, and other such high value-added organic compounds.