Palladium-Catalyzed Intramolecular Hydroalkylation of Alkenyl- ?-Keto Esters, ?-Aryl Ketones, and Alkyl Ketones in the Presence of Me3SiCl or HCl
作者:Xiaoqing Han、Xiang Wang、Tao Pei、Ross A. Widenhoefer
DOI:10.1002/chem.200400459
日期:2004.12.17
palladium-catalyzed hydroalkylation, but rather served as a source of HCl, which presumably catalyzes enolization of the ketone. Identification of HCl as the active promoter of palladium-catalyzed hydroalkylation led to the development of an effective protocol for the hydroalkylation of alkyl 3-butenyl ketones that employed sub-stoichiometric amounts of 2, HCl, and CuCl2 in a sealed tube at 70 degrees C.
作者:Gary A. Molander、Michael S. Quirmbach、Luiz F. Silva、Keith C. Spencer、Jaume Balsells
DOI:10.1021/ol015763l
日期:2001.7.1
toward the total synthesis of the sesterterpenoid variecolin (1) is presented. Synthesis of the key hemiketal, containing the core ABCringskeleton, has been achieved on a model system by an expeditious route utilizing samarium(II) iodide. Furthermore, enantioselective syntheses of component fragments for the total synthesis have been developed.
Synthesis and biological evaluation of S-adenosyl-1,12-diamino-3-thio-9-azadodecane, a multisubstrate adduct inhibitor of spermine synthase
作者:Patrick M. Woster、Alison Y. Black、Keith J. Duff、James K. Coward、Anthony E. Pegg
DOI:10.1021/jm00126a026
日期:1989.6
for specific inhibitors of the enzymes involved in polyamine biosynthesis, we have designed and synthesized a multisubstrateadductinhibitor, S-adenosyl-1,12-diamino-3-thio-9-azadodecane (AdoDATAD), in which critical portions of the nucleophilic aminopropyl acceptor are covalently linked to critical portions of the electrophilic aminopropyl donor to form a potent and specific inhibitor of spermine
Sequenced reactions with samarium(II) iodide. Intermolecular ketyl-olefin coupling/intramolecular nucleophilic acyl substitution for the preparation of six-, seven-, and eight-membered carbocycles
作者:Gary A Molander、Masakazu Sono
DOI:10.1016/s0040-4020(98)00584-5
日期:1998.8
A samarium(II) iodide-promoted sequence consisting of an intermolecular ketyl-olefin coupling followed by an intramolecular nucleophilic acyl substitution is described. This process leads to functionalized six- to eight-membered monocyclic and bicyclic ring systems in moderate to good yields.
The invention provides the compounds represented by the formula (I)
in which, R stands for a dihydroxy-substituted C1- C6 alkyl group, and Cy stands for an optionally substituted C6 - C10 bi- or tri-cyclic aliphatic carbocyclic group. These compounds act as nociceptin receptor antagonist, and are useful, for example, as relievers against tolerance to narcotic analgesic, dependence on narcotic analgesic or addiction; analgesic enhancers; antiobestic or appetite suppressors; treating or prophylactic agents for cognitive impairment and dementia/amnesia; agents for treating developmental cognitive abnormality; remedy for schizophrenia; agents for treating neurodegenerative diseases; anti-depressant or treating agents for affective disorder; treating or prophylactic agents for diabetes insipidus; treating or prophylactic agents for polyuria; and remedy for hypotension and the like.