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    Enantioselective Decarboxylative Alkylation Reactions: Catalyst Development, Substrate Scope, and Mechanistic Studies

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    Type
    Article
    Authors
    Behenna, Douglas C.
    Mohr, Justin T.
    Sherden, Nathaniel H.
    Marinescu, Smaranda C.
    Harned, Andrew M.
    Tani, Kousuke
    Seto, Masaki
    Ma, Sandy
    Novák, Zoltán
    Krout, Michael R.
    McFadden, Ryan M.
    Roizen, Jennifer L.
    Enquist, John A.
    White, David E.
    Levine, Samantha R.
    Petrova, Krastina V.
    Iwashita, Akihiko
    Virgil, Scott C.
    Stoltz, Brian M.
    KAUST Grant Number
    KUS-11-006-02
    Date
    2011-11-14
    Online Publication Date
    2011-11-14
    Print Publication Date
    2011-12-09
    Permanent link to this record
    http://hdl.handle.net/10754/598161
    
    Metadata
    Show full item record
    Abstract
    α-Quaternary ketones are accessed through novel enantioselective alkylations of allyl and propargyl electrophiles by unstabilized prochiral enolate nucleophiles in the presence of palladium complexes with various phosphinooxazoline (PHOX) ligands. Excellent yields and high enantiomeric excesses are obtained from three classes of enolate precursor: enol carbonates, enol silanes, and racemic β-ketoesters. Each of these substrate classes functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reaction scope, and applications in target-directed synthesis are reported. Experimental observations suggest that these alkylation reactions occur through an unusual inner-sphere mechanism involving binding of the prochiral enolate nucleophile directly to the palladium center.
    Citation
    Behenna DC, Mohr JT, Sherden NH, Marinescu SC, Harned AM, et al. (2011) Enantioselective Decarboxylative Alkylation Reactions: Catalyst Development, Substrate Scope, and Mechanistic Studies. Chem Eur J 17: 14199–14223. Available: http://dx.doi.org/10.1002/chem.201003383.
    Sponsors
    This publication is based on work supported by award number KUS-11-006-02, made by the King Abdullah University of Science and Technology (KAUST). We thank the NIH-NIGMS (R01 GM080269-01 and postdoctoral fellowships to AMH and DEW), The Fannie and John Hertz Foundation (predoctoral fellowship to DCB), Eli Lilly (predoctoral fellowships to JTM, RMM, and MRK), Ono Pharmaceutical Co., Ltd. (postdoctoral fellowship to KT), The Hungarian-American Enterprise Scholarship Fund (postdoctoral fellowship to ZN), Takeda Pharmaceutical Co., Ltd. (postdoctoral fellowship to MS), The California Tobacco-Related Disease Research Program of the University of California (predoctoral fellowship to JLR, grant number 14DT-0004), Marcella R. Bonsall and the Dalton Fund (undergraduate fellowships to SRL), the Caltech Amgen Scholars Program (undergraduate fellowship to KVP), The 21st Century COE Program for Frontiers in Fundamental Chemistry from the Ministry of Education, Culture, Sports, Science and Technology, Japan (financial support to AI), the A. P. Sloan Foundation, Research Corporation, the Dreyfus Foundation, Bristol-Myers Squibb, GlaxoSmithKline, Johnson and Johnson, Amgen, Merck Research Laboratories, Pfizer, Novartis, Roche, Abbott Laboratories, Boehringer-Ingelheim, AstraZeneca, and Caltech for financial support. We acknowledge Dr. Mike Day and Larry Henling for assistance with X-ray crystallography. Ruthenium olefin metathesis catalysts were generously donated by Materia.
    Publisher
    Wiley
    Journal
    Chemistry - A European Journal
    DOI
    10.1002/chem.201003383
    PubMed ID
    22083969
    PubMed Central ID
    PMC3365686
    ae974a485f413a2113503eed53cd6c53
    10.1002/chem.201003383
    Scopus Count
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