共查询到20条相似文献,搜索用时 15 毫秒
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Akinari Hamajima Minoru Isobe 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2009,121(16):2985-2989
Eines der Haupttoxine bei Fischvergiftungen, das Ciguatoxin (siehe Struktur), war Ziel einer Totalsynthese. Der Syntheseweg beruht auf der Kupplung dreier Segmente, und die Schlüsselumwandlungen umfassen eine Komplexbildung zwischen Acetylen und Dicobalthexacarbonyl.
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Miho Narita Hirokazu Urabe Fumie Sato 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2002,114(19):3823-3826
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Daniel Clare Benjamin C. Dobson Phillip A. Inglesby Christophe Aïssa 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(45):16344-16348
The functionalization of aryl and heteroaryls using α‐carbonyl sulfoxonium ylides without the help of a directing group has remained so far a neglected area, despite the advantageous safety profile of sulfoxonium ylides. Described herein are the cyclizations of α‐carbonyl sulfoxonium ylides onto benzenes, benzofurans and N‐p‐toluenesulfonyl indoles in the presence of a base in HFIP, whereas pyrroles and N‐methyl indoles undergo cyclization in the presence of an iridium catalyst. Significantly, these two sets of conditions are chemospecific for each groups of substrates. 相似文献
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Dr. Luong Phong Ho Angelika Neitzel Dr. Thomas Bannenberg Prof. Dr. Matthias Tamm 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(4):e202104139
The lithium salts of anionic N-heterocyclic thiones and selones [{(WCA-IDipp)E}Li(toluene)] ( 1 : E=S; 2 : E=Se; WCA=B(C6F5)3, IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene), which contain a weakly coordinating anionic (WCA) borate moiety in the imidazole backbone were reacted with Me3SiCl, to furnish the silylated adducts (WCA-IDipp)ESiMe3 ( 3 : E=S; 4 : E=Se). The reaction of the latter with [(η5-C5Me5)MCl2]2 (M=Rh, Ir) afforded the rhodium(III) and iridium(III) half-sandwich complexes [{(WCA-IDipp)E}MCl(η5-C5Me5)] ( 5 – 8 ). The direct reaction of the lithium salts 1 and 2 with a half or a full equivalent of [M(COD)Cl]2 (M=Rh, Ir) afforded the monometallic complexes [{(WCA-IDipp)E}M(COD)] ( 9 – 12 ) or the bimetallic complexes [μ2-{(WCA-IDipp)E}M2(COD)2(μ2-Cl)] ( 13 – 16 ), respectively. The bonding situation in these complexes has been investigated by means of density functional theory (DFT) calculations, revealing thiolate or selenolate ligand character with negligible metal-chalcogen π-interaction. 相似文献
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