Gold(I)/(III)-Catalyzed Rearrangement of Divinyl Ketones and Acyloxyalkynyloxiranes into Cyclopentenones
作者:Marie Hoffmann、Jean-Marc Weibel、Pierre de Frémont、Patrick Pale、Aurélien Blanc
DOI:10.1021/ol403663j
日期:2014.2.7
Multifaceted gold(I/III) catalysts with their carbophilic and oxophilic characters catalyzed very efficiently the formation of hydroxylated cyclopentenones from simple divinyl ketones or acyloxyalkynyloxiranes. The Nazarov reaction is rapidly performed in dichloroethane with 5 mol % of the simple gold(III) trichloride salt at 70 °C, while the rearrangement of alkynyloxiranes requires 5 mol % of a more
The synthesis of some cyclic diketones isolated from coffee
作者:M.A. Gianturco、P. Friedel
DOI:10.1016/0040-4020(63)85019-x
日期:1963.1
The syntheses of several alkylated derivatives of cyclopentane-1,2-dione(cyclopent-2-en-2-ol-1-one), four of which have been previously identified in roasted coffee2, are described.
Alternative Synthesis of 2-Hydroxy-3,5,5-trimethylcyclopent-2-en-1-one
作者:Christian Chapuis、Christine Saint-Léger
DOI:10.1002/hlca.200900231
日期:2010.1
AbstractThe 2‐hydroxy‐3,5,5‐trimethylcyclopent‐2‐en‐1‐one (1) was synthesized in 42% yield by rearrangement of epoxy ketone 10 on treatment with BF3⋅Et2O under anhydrous conditions. Intermediate 10 was available from the known enone 8, either via direct epoxidation (60% H2O2, NaOH, MeOH; yield 50%), or via reduction to the corresponding allylic alcohol 14 (LiAlH4, THF), followed by epoxidation ([VO(acac)2], tBuOOH) and reoxidation under Swern conditions, in 37% total yield.
BUYCK L. DE; VERHE E.; KIMPE N. DE; COURTHEYN D.; SCHAMP N., BULL. SOC. CHIM. BELG., 1981, 90, NO 8, 837-846
作者:BUYCK L. DE、 VERHE E.、 KIMPE N. DE、 COURTHEYN D.、 SCHAMP N.
DOI:——
日期:——
MODIFYING OR ENHANCING A FLAVOR OF FOOD AND BEVERAGE PRODUCTS