Synthetic modeling of the active site of native metalloenzymes by trimethylacetatozinc complexes
摘要:
Synthetic approaches are discussed to a preparation of binuclear trimethylacetatozinc complexes containing an M-2(mu-OOCR)(2)L-4 binuclear fragment, which is found in the active site of native metalloenzymes.
Cobalt-Catalyzed Electrophilic Amination of Aryl- and Heteroarylzinc Pivalates with <i>N</i>
-Hydroxylamine Benzoates
作者:Yi-Hung Chen、Simon Graßl、Paul Knochel
DOI:10.1002/anie.201710931
日期:2018.1.22
Aryl‐ and heteroarylzincpivalates can be aminated with O‐benzoylhydroxylamines at 25 °C within 2–4 h in the presence of 2.5–5.0 % CoCl2⋅2 LiCl to furnish the corresponding tertiary arylated or heteroarylated amines in good yields. This electrophilicamination also provides access to diarylamines and aryl(heteroaryl)amines. A new tuberculosis drug candidate (Q203) was prepared in six steps and 56 %
The preparation and reactivity of new solid heterocyclic organozinc reagents, namely N-protected (1H-tetrazol-5-yl)zinc pivalates, as storable solids with appreciably air and moisture stability are reported. They are obtained in high yields from protected 1H-tetrazoles by deprotonation using the mixed zinc–magnesium base TMPZnCl·Mg(OPiv)2 (abbreviated as TMPZnOPiv; TMP = 2,2,6,6-tetramethylpiperidyl)
Synthesis of Complex Druglike Molecules by the Use of Highly Functionalized Bench-Stable Organozinc Reagents
作者:Thomas J. Greshock、Keith P. Moore、Ray T. McClain、Ana Bellomo、Cheol K. Chung、Spencer D. Dreher、Peter S. Kutchukian、Zhengwei Peng、Ian W. Davies、Petr Vachal、Mario Ellwart、Sophia M. Manolikakes、Paul Knochel、Philippe G. Nantermet
DOI:10.1002/anie.201604652
日期:2016.10.24
representative set of 17 organozinc pivalates with 18 polyfunctional druglike electrophiles (informers) in Negishi cross‐coupling reactions was evaluated by high‐throughput experimentation protocols. The high‐fidelity scaleup of successful reactions in parallel enabled the isolation of sufficient material for biological testing, thus demonstrating the high value of these new solid zinc reagents in a drug‐discovery
Decarboxylative Negishi Coupling of Redox‐Active Aliphatic Esters by Cobalt Catalysis
作者:Xu‐Ge Liu、Chu‐Jun Zhou、E. Lin、Xiang‐Lei Han、Shang‐Shi Zhang、Qingjiang Li、Honggen Wang
DOI:10.1002/anie.201806799
日期:2018.10
A cobalt‐catalyzed decarboxylative Negishi coupling reaction of redox‐active aliphatic esters with organozinc reagents was developed. The method enabled efficient alkyl–aryl, alkyl–alkenyl, and alkyl–alkynyl coupling reactions under mild reaction conditions with no external ligand or additive needed. The success of an in situ activation protocol and the facile synthesis of the drug molecule (±)‐preclamol
Cobalt in Organic Synthesis Abstract A robust and scalable CoCl2-catalyzed cross-coupling between functionalized arylzinc pivalates and various electron-poor (hetero)aryl and alkenyl halides is reported. A robust and scalable CoCl2-catalyzed cross-coupling between functionalized arylzinc pivalates and various electron-poor (hetero)aryl and alkenyl halides is reported.