Search Results - "Hammann, Jeffrey M"

A Transition-Metal-Free Synthesis of Fluorinated Naphthols by Hammann, Jeffrey M., Unzner, Teresa A., Magauer, Thomas

“…Herein, we describe a transition‐metal‐free protocol for the conversion of simple 2‐allyl‐3‐(trifluoromethyl)phenols into substituted 5‐fluoronaphthalen‐1‐ols…”
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Recent Developments in Negishi Cross-Coupling Reactions by Haas, Diana, Hammann, Jeffrey M, Greiner, Robert, Knochel, Paul

“…This Perspective describes general methods for the preparation of polyfunctional zinc organometallics and their use in Negishi cross-coupling reactions. Recent…”
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Cobalt-Catalyzed Negishi Cross-Coupling Reactions of (Hetero)Arylzinc Reagents with Primary and Secondary Alkyl Bromides and Iodides by Hammann, Jeffrey M., Haas, Diana, Knochel, Paul

“…We report a cobalt‐catalyzed cross‐coupling of di(hetero)arylzinc reagents with primary and secondary alkyl iodides or bromides using THF‐soluble CoCl2⋅2 LiCl…”
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A Robust and Broadly Applicable Cobalt‐Catalyzed Cross‐Coupling of Functionalized Bench‐Stable Organozinc Pivalates with Unsaturated Halides by Hammann, Jeffrey M., Lutter, Ferdinand H., Haas, Diana, Knochel, Paul

“…We report a robust and broadly applicable CoCl2‐catalyzed cross‐coupling between functionalized aryl and heteroaryl zinc pivalates and various electron‐poor…”
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Cobalt‐Catalyzed Cross‐Coupling of Functionalized Alkylzinc Reagents with (Hetero)Aryl Halides by Lutter, Ferdinand H., Grokenberger, Lucie, Spieß, Philipp, Hammann, Jeffrey M., Karaghiosoff, Konstantin, Knochel, Paul

“…A combination of 10 % CoCl2 and 20 % 2,2′‐bipyridine ligands enables cross‐coupling of functionalized primary and secondary alkylzinc reagents with various…”
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Mild Cobalt-Catalyzed Negishi Cross-Couplings of (Hetero)arylzinc Reagents with (Hetero)aryl Halides by Haas, Diana, Hammann, Jeffrey M., Lutter, Ferdinand H., Knochel, Paul

“…A catalytic system consisting of CoCl2⋅2 LiCl (5 mol %) and HCO2Na (50 mol %) enables the cross‐coupling of various N‐heterocyclic chlorides and bromides as…”
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Cobalt-Catalyzed C(sp2)–C(sp3) Cross-Coupling Reactions of Diarylmanganese Reagents with Secondary Alkyl Iodides by Hofmayer, Maximilian S, Hammann, Jeffrey M, Haas, Diana, Knochel, Paul

“…A cobalt-catalyzed cross-coupling of diarylmanganese reagents with secondary alkyl iodides using the THF-soluble salt CoCl2·2LiCl, which leads to the…”
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Practical Ni-Catalyzed Cross-Coupling of Unsaturated Zinc Pivalates with Unsaturated Nonaflates and Triflates by Hofmayer, Maximilian S, Lutter, Ferdinand H, Grokenberger, Lucie, Hammann, Jeffrey M, Knochel, Paul

“…A practical nickel-catalyzed cross-coupling of (hetero)­aryl or alkynylzinc pivalates with various unsaturated nonaflates or triflates is described. Organozinc…”
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Cobalt-Catalyzed Cross-Couplings of Bench-Stable Alkynylzinc Pivalates with (Hetero)Aryl and Alkenyl Halides by Hammann, Jeffrey M, Thomas, Lucie, Chen, Yi-Hung, Haas, Diana, Knochel, Paul

“…A catalytic system consisting of CoCl2·2LiCl and TMEDA enables the cross-coupling of various electron-poor aryl and heteroaryl halides with various alkynylzinc…”
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Cobalt-Mediated Diastereoselective Cross-Coupling Reactions between Cyclic Halohydrins and Arylmagnesium Reagents by Hammann, Jeffrey M., Steib, Andreas K., Knochel, Paul

“…Cyclic TBS-protected iodohydrins (and bromohydrins) undergo a highly diastereoselective cross-coupling with various aryl- and heteroarylmagnesium reagents in…”
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Diastereoselective Cobalt-Mediated Cross-Couplings of Cycloalkyl Iodides with Alkynyl or (Hetero)Aryl Grignard Reagents by Hammann, Jeffrey M, Haas, Diana, Tüllmann, Carl-Phillip, Karaghiosoff, Konstantin, Knochel, Paul

“…A highly diastereoselective cross-coupling of variously substituted cycloalkyl iodides with alkynyl and (hetero)­aryl Grignard reagents using cobalt­(II)…”
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Oxidant-controlled regioselectivity in the oxidative arylation of N-acetylindoles by Potavathri, Shathaverdhan, Dumas, Ashley S., Dwight, Timothy A., Naumiec, Gregory R., Hammann, Jeffrey M., DeBoef, Brenton

“…N-Acetylindoles can be oxidatively coupled with arenes such as benzene or pentafluorobenzene in dioxane. The use of Cu(OAc) 2 as the stoichiometric oxidant…”
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Bis(pyrazolyl)methane Copper Complexes as Robust and Efficient Catalysts for Sonogashira Couplings by Moegling, Julian, Benischke, Andreas D., Hammann, Jeffrey M., Vepřek, Nynke A., Zoller, Florian, Rendenbach, Bettina, Hoffmann, Alexander, Sievers, Holger, Schuster, Michael, Knochel, Paul, Herres-Pawlis, Sonja

“…A series of bis(pyrazolyl)methane copper complexes were found to catalyze a fast palladium‐free Sonogashira coupling reaction of several iodoarenes with…”
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Stereoselective Synthesis and Reactions of Secondary Alkyllithium Reagents Functionalized at the 3-Position by Moriya, Kohei, Didier, Dorian, Simon, Meike, Hammann, Jeffrey M., Berionni, Guillaume, Karaghiosoff, Konstantin, Zipse, Hendrik, Mayr, Herbert, Knochel, Paul

“…Secondary alkyllithium reagents bearing an OTBS group (TBS=tert‐butyldimethylsilyl) at the 3‐position can be prepared stereoconvergently through an I/Li…”
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Cobalt‐katalysierte Kreuzkupplung funktionalisierter Alkylzinkreagenzien mit (Hetero‐)Arylhalogeniden by Lutter, Ferdinand H., Grokenberger, Lucie, Spieß, Philipp, Hammann, Jeffrey M., Karaghiosoff, Konstantin, Knochel, Paul

“…Eine Kombination aus 10 % CoCl2 und 20 % 2,2′‐Bipyridin als Liganden ermöglicht die Kreuzkupplung von funktionalisierten primären und sekundären…”
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A Robust and Broadly Applicable Cobalt‐Catalyzed Cross‐Coupling of Functionalized Bench‐Stable Organozinc Pivalates with Unsaturated Halides by Hammann, Jeffrey M., Lutter, Ferdinand H., Haas, Diana, Knochel, Paul

“…We report a robust and broadly applicable CoCl2‐catalyzed cross‐coupling between functionalized aryl and heteroaryl zinc pivalates and various electron‐poor…”
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Cobalt-katalysierte Negishi-Kreuzkupplungen von (Hetero)Arylzinkreagentien mit primären und sekundären Alkylbromiden und -iodiden by Hammann, Jeffrey M., Haas, Diana, Knochel, Paul

“…Abstract Wir berichten über eine Cobalt‐katalysierte Kreuzkupplung von Di(hetero)arylzinkreagentien mit primären und sekundären Alkyliodiden und ‐bromiden…”
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Milde Cobalt-katalysierte Negishi-Kreuzkupplungen von (Hetero-)Arylzinkreagentien mit (Hetero-)Arylhalogeniden by Haas, Diana, Hammann, Jeffrey M., Lutter, Ferdinand H., Knochel, Paul

“…Ein katalytisches System bestehend aus 5Mol-% CoCl22LiCl und 50Mol-% HCO2Na ermöglicht Kreuzkupplungen verschiedener N-heterozyklischer Chloride und Bromide…”
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Cobalt‐katalysierte Negishi‐Kreuzkupplungen von (Hetero)Arylzinkreagentien mit primären und sekundären Alkylbromiden und ‐iodiden by Hammann, Jeffrey M., Haas, Diana, Knochel, Paul

“…Wir berichten über eine Cobalt‐katalysierte Kreuzkupplung von Di(hetero)arylzinkreagentien mit primären und sekundären Alkyliodiden und ‐bromiden unter…”
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Milde Cobalt‐katalysierte Negishi‐Kreuzkupplungen von (Hetero‐)Arylzinkreagentien mit (Hetero‐)Arylhalogeniden by Haas, Diana, Hammann, Jeffrey M., Lutter, Ferdinand H., Knochel, Paul

“…Ein katalytisches System bestehend aus 5 Mol‐% CoCl2⋅2 LiCl und 50 Mol‐% HCO2Na ermöglicht Kreuzkupplungen verschiedener N‐heterozyklischer Chloride und…”
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