Aspartyl dipeptide ester derivatives and sweeteners
申请人:AJINOMOTO CO. INC.
公开号:US20030065210A1
公开(公告)日:2003-04-03
Aspartyl dipeptide ester derivatives, such as a N-[N-[3-(3,4-dihydroxyphenyl)-3-methylbutyl]-L-&agr;-aspartyl]-L-phenylalanine 1-methyl ester, or salts thereof, having a high degree of sweetness compared to conventional sweeteners. These derivatives are excellent in sweetening potency and may be used as sweetener components in products such as foods and drinks. They may also be used as low calorie sweeteners and in methods of sweetening products. Foods and drinks comprising these derivatives as well as methods for their production.
Reagent-controlled stereoselective synthesis of (±)-gallo- and (±)-epigallo-catechin gallates
作者:Hiroshi Tanaka、Ayaka Chino、Takashi Takahashi
DOI:10.1016/j.tetlet.2012.02.065
日期:2012.5
Synthesis of (±)-gallocatechin and (±)-epigallocatechin gallates by electrophilic cycloarylation is reported. The precursors for cyclization were prepared by reagent-controlled stereo-selective opening of epoxide with phenol. Activation of the S-oxidized S,O-acetal enabled electrophilic cycloarylation to stereoselectively provide the acylated catechins.