Alternative Synthesis of 2-Hydroxy-3,5,5-trimethylcyclopent-2-en-1-one
摘要:
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.
Nickel-Catalyzed Difunctionalization of Unactivated Alkenes Initiated by Unstabilized Enolates
摘要:
This report demonstrates the possibility of a nickel-catalyzed difunctionalization of unactivated alkenes initiated by an unstabilized enolate nucleophile. The process tolerates a diverse range of electrophiles, including aryl, heteroaryl, alkenyl, and amino electrophiles. An electron-deficient phosphine ligand and a tetrabutylammonium salt additive were crucial for promoting efficient vicinal difunctionalization.
Cyclocarbonylation of acyclic 1,3-dienes via their tricarbonyl iron complexes : Cyclopenten-2-ones and dicarbonyl cyclopentadienyl iron halides
作者:Michel Franck-Neumann、Enrique Luis Michelotti、Roland Simler、Jean-Michel Vernier
DOI:10.1016/s0040-4039(00)60188-0
日期:1992.11
of acyclic 1,3-dienes can be converted to conjugated cyclopentenones by decomplexation with aluminium halides. Most complexes of a simple dienes need drastic conditions for the cyclocarbonylation to occur (100 Atm CO, 1000° C), with the exception of 1,1,3-trialkylbutadiene complexes which are nearly quantitatively converted into cyclopentenones at room temperature, even in the absence of a CO atmosphere
Triquinane sesquiterpenes. An iterative, highly stereocontrolled synthesis of (.+-.)-silphinene
作者:Leo A. Paquette、Andrea Leone-Bay
DOI:10.1021/ja00363a024
日期:1983.11
Synthese en 15 etapes a partir de la dimethyl-4,4 cyclopentene-2one. La formation des noyaux cyclopentanes est obtenue par une double addition d'un reactif organocuivrique fonctionnalise suivie d'une cyclisation aldol
合成这些 en 15 etapes a partir de la dimethyl-4,4 cyclopentene-2one。La Formation des noyaux cyclopentanes est obtenue par une double added d'un reactif Organiccuivrique fonctionnalise suivie d'une cyclisation aldol
NITROXYL ION SOURCE WITH SECOND ORDER REACTION NITROXYL RELEASE
申请人:Toone Eric
公开号:US20100094060A1
公开(公告)日:2010-04-15
C-nitroso compound releases nitroxyl ion in blood in a second order reaction.
Intramolecular [2+2] photocycloaddition of enone-acetals
作者:Michael C. Pirrung、Stephen A. Thomson
DOI:10.1016/s0040-4039(00)84621-3
日期:——
Lewis acid catalyzed condensation of unsaturated orthoformates with dienol ethers gives enone-acetals suitable for intramolecular photocyclo-additions, yielding heterocyclic precursors to sesquiterpene lactones.
Studies on the sesquiterpenoids of hypolepis punctata mett.—II
作者:Yuji Hayashi、Mugio Nishizawa、Takeo Sakan
DOI:10.1016/0040-4020(77)80074-4
日期:1977.1
Hypacrone (1), a new seco-illudoid, was synthesized by several steps, including a cross aldol condensation of two major moieties, a diketone (2) and a cyclopentenone derivative (11).