Enantioselective Synthesis of Carbo- and Heterocycles through a CuH-Catalyzed Hydroalkylation Approach
摘要:
The enantios elective, intramolecular hydro-alkylation of halide-tethered styrenes has been achieved through a copper hydride-catalyzed process. This approach allowed for the synthesis of enantioenriched cydobutanes, cyclopentanes, indanes, and six-membered N- and O-heterocycles. This protocol was applied to the synthesis of the commercial serotonin reuptake inhibitor (-)-paroxetine.
Efficient synthesis of <i>N</i>-allylated 2-nitroiminoimidazolidine analogues from Baylis–Hillman bromides
作者:Sriramoju Bharath Kumar、Chebolu Naga Sesha Sai Pavan Kumar、Amlipur Santhoshi、Koochana Pranay Kumar、U. S. N. Murthy、Vaidya Jayathirtha Rao
DOI:10.1080/00397911.2016.1255333
日期:2017.1.17
ABSTRACT Various Baylis–Hillman–derived new N-allylated 2-nitroiminoimidazolidine analogs were efficiently prepared using potassium carbonate as base. Simple workup procedure, excellent yields, and mild reaction conditions are the salient features of this method. All the synthesized compounds are screened for their larvicidal activity on fourth instar mosquito larvae, Culex quinquefasciatus. GRAPHICAL
A novel protocol for the facile construction of tetrahydroquinoline fused tricyclic frameworks via an intramolecular 1,3-dipolar nitrile oxide cycloaddition reaction
作者:Manickam Bakthadoss、Varathan Vinayagam
DOI:10.1039/c5ob01060h
日期:——
An efficient method towards the synthesis of quinoline fusedtricyclic compounds involving an intramolecular1,3-dipolar nitrile oxide cycloaddition reaction utilizing Baylis–Hillman derivatives in good yields has been described for the first time. A highly functionalized tricyclic framework was created by forming two rings and two adjacent stereocentres through the formation of two N–C bonds, one
Novel Synthesis of (<i>E</i>)-3-Arylidene-2,3-dihydrobenzo[<i>b</i>][1,4]oxazepin-4(5<i>H</i>)-ones Using Baylis–Hillman Derivatives via Reductive Cyclization
作者:Manickam Bakthadoss、Gandhi Murugan
DOI:10.1080/00397910802519166
日期:2009.3.10
Abstract A simple synthesis of novel (E)-3-arylidene-2,3-dihydrobenzo[b][1,4]oxazepin-4(5H)-ones from bromides of the Baylis--Hillman adducts using Fe/AcOH for the in situ reduction of nitro group, into an amino group, followed by the cyclization as a key step, has been described.
Metal-free, regio- and stereoselective S-methylation/phenylation of allyl halides using sulfoxides as sulfenylating agent
作者:Rakhee Choudhary、Rekha Bai、Pratibha Singh、Mahesh C. Sharma、Satpal Singh Badsara
DOI:10.1016/j.tet.2017.05.088
日期:2017.7
A DCP promoted metal-free, regio and stereoselective S-methylation/phenylation of allyl halides using sulfoxides as sulfenylating agent is described. A variety of multifunctional allyl halides underwent S-methylation and S-phenylation by using dimethyl sulfoxide (DMSO) and diphenyl sulfoxide (DPSO) under the reaction conditions employed to provide the resulting thioethers in good to excellent yields
The palladium-catalyzed remote meta-C–H olefination of geometrically challenging substitutedcinnamates using a nitrile directing group derived from 2-cyanobenzoic acid has been described. This new protocol is applicable to various olefin coupling partners and provides the corresponding meta-olefinated products in very good yields and with high selectivity. In addition, using this methodology, a variety