ABSTRACT
Treatment of CpRuH(PP) (PP=dppm, dppe) with TlPF6 produced [CpRu(H)(Tl)(PP)]PF6 . X-ray diffraction and computational studies suggest that the complexes contain a Ru-H-Tl 3c-2e bond and can be viewed as the first σ-complexes of period 6 main-group hydrides [CpRu{η2 -(H-Tl)}(PP)]PF6 or [Tl{η2 -H-RuCp(PP)}]PF6 . The complexes can be stored as a solid at room temperature for days without appreciable decomposition, but are unstable in solution and evolved to the trimetallic complexes [{CpRu(PP)}2 (µ-Tl)]PF6 .
ABSTRACT
The electrophilic substitution reactions of metallabenzynes Os(≡CC(R)âC(CH(3))C(R)âCH)Cl(2)(PPh(3))(2) (R = SiMe(3), H) were studied. These metallabenzynes react with electrophilic reagents, including Br(2), NO(2)BF(4), NOBF(4), HCl/H(2)O(2), and AlCl(3)/H(2)O(2) to afford the corresponding bromination, nitration, nitrosation, and chlorination products. The reactions usually occur at the C2 and C4 positions of the metallacycle. These observations support the notion that metallabenzynes exhibit aromatic properties.
Subject(s)
Organometallic Compounds/chemical synthesis , Osmium/chemistry , Models, Molecular , Molecular Structure , Organometallic Compounds/chemistry , StereoisomerismABSTRACT
2-Azido-3-arylacrylates react with alpha-diazocarbonyl compounds and triphenylphosphine to furnish isoquinolines in 60-92% yields. The tandem process involves a Wolff rearrangement, an aza-Wittig reaction, and an electrocyclic ring closure. The procedure is efficient, rapid, and general, and the substrates are readily available.
Subject(s)
Acrylates/chemistry , Diazonium Compounds/chemistry , Isoquinolines/chemical synthesis , Isoquinolines/chemistry , Molecular Structure , StereoisomerismABSTRACT
A one-pot cascade approach to 4-alkylidene-beta-lactams and N, N'-diarylamidines from aryl azides and aryloxyacetyl chlorides has been developed. The chemical outcome of the reaction can be controlled selectively by an appropriate choice of the stoichiometric ratio of different substrates and reagents. The products should find use in pharmaceutical discovery, especially in the development of new antimicrobial agents against multidrug-resistant pathogens.
Subject(s)
Acetates/chemistry , Amidines/chemical synthesis , Azides/chemistry , Chlorides/chemistry , Ketamine/chemistry , Oxygen/chemistry , beta-Lactams/chemical synthesis , Acylation , Alkylation , Amidines/chemistry , Crystallography, X-Ray , Models, Molecular , Molecular Structure , beta-Lactams/chemistryABSTRACT
Aromatic aldehydes reacted with anilines and benzenediazonium-2-carboxylate to afford 6-aryl-phenanthridines. The reaction furnishes a rapid and direct construction of substituted phenanthridine rings from readily available starting materials via a one-pot cascade process.
