• Bulletin of the Korean Chemical Society
• /
• 제30권4호
• /
• pp.797-802
• /
• 2009

Potential of acetates and related compounds in glacial acetic acid as a catalyst for aldol-type condensation reactions was examined. Reactions of cycloalkanones or selected heteroaromatics with aldehydes in presence of 10 mol% of various acetates in acetic acid afforded ${\alpha},{\alpha}$'-bis(substituted-benzylidene)cycloalkanones and substituted-benzylidene-mackinazolinones, respectively, in good yields. Among the compounds tested, ammonium acetate is the best and effective especially towards the reactions of mackinazolinone and aliphatic aldehydes to afford 6-alkylidenemackinazolinones.

• Bulletin of the Korean Chemical Society
• /
• 제23권9호
• /
• pp.1333-1336
• /
• 2002

• Bulletin of the Korean Chemical Society
• /
• 제29권1호
• /
• pp.76-80
• /
• 2008

Reductive acetylation of a variety of carbonyl compounds such as aldehydes, ketones and a,b-unsaturated enals/enones was carried out efficiently with pyridine zinc borohydride, (Py)Zn(BH4)2, in a mixture of THF-EtOAc at room temperature or under reflux condition. The corresponding acetates were obtained in high to excellent yields. In addition, chemoselective reductive acetylation of aldehydes over ketones was achieved perfectly with the reagent at room temperature.

• Bulletin of the Korean Chemical Society
• /
• 제25권1호
• /
• pp.27-28
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• 제25권1호
• /
• pp.33-34
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• 제25권11호
• /
• pp.1733-1736
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• 제21권9호
• /
• pp.901-904
• /
• 2000

The mechanism for the photo-Fries rearrangement of phenyl acetate andbiphenylyl acetates were reinvestigat-ed in phenol (or phenol derivatives) containing media. The results showed that the phenol (or phenol deriva-tives) which is the most common by-product of Fries reaction reacts with acyl radical togive Fries-product. These phenol (or phenol derivatives) contributions to the Fries-products were suggested as the Trivial mecha-nism for the photo-Fries reaction.

• Bulletin of the Korean Chemical Society
• /
• 제23권8호
• /
• pp.1055-1056
• /
• 2002

• Bulletin of the Korean Chemical Society
• /
• 제10권2호
• /
• pp.204-205
• /
• 1989

• 생약학회지
• /
• 제28권1호
• /
• pp.21-25
• /
• 1997

The diets with three types of triterpenoid constituents, which were isolated from Lactuca indica, provoked significant changes of serum lipoprotein-cholesterol meta bolisms of hypercholesterolemic rats induced by high-cholesterol diet, together with the reduction of atherogenic index. Especially, triterpene acetates which have triterpene moieties such as ${\beta}-amyrin$, ${\alpha}-amyrin$, lupeol, pseudotaraxasterol, taraxasterol and germanicol showed a considerable hypocholesterolemic activity. The rat given orally with triterpene acetates did not exhibit a significantly higher value of atherogenic index than that of normal rats.