Cu(<scp>i</scp>) catalysed annulation of isothiocyanates/isocyanates with 2-iodo-sulfonamides: synthesis of benzodithiazines, benzothiadiazinones, benzothiazinylidene-anilines and benzothiazolylidene-anilines
作者:K. Sandeep、Alla Siva Reddy、K. C. Kumara Swamy
DOI:10.1039/c9ob00994a
日期:——
Cu(i)-catalysed cyclisationreaction of 2-iodobenzene sulfonamides with aryl-isothiocyanates and isocyanates that affords functionalised benzodithiazines and benzothiadiazinones, respectively, has been developed. Thus, in the reaction with aryl isothiocyanates (Ar-N[double bond, length as m-dash]C[double bond, length as m-dash]S), the C[double bond, length as m-dash]S moiety participates in the cyclisation leading
Palladium-Catalyzed Reactions of Allenes with 2-Iodobenzenesulfonamides: Simple Synthesis of Benzosultams under Green Conditions
作者:K. Kumara Swamy、M. Nagarjuna Reddy
DOI:10.1055/s-0033-1340821
日期:——
palladium-catalyzed reaction for the synthesis of benzosultams from allenes and 2-iodobenzenesulfonamides in poly(ethylene glycol) medium is described. This route is compared with a second method involving an internal Heck reaction of alkene-functionalized 2-iodobenzenesulfonamides. Key products were characterized by single-crystal X-ray crystallography. A palladium-catalyzed reaction for the synthesis of benzosultams
Palladium-catalyzedhighly regioselective synthesis of benzotriazole appended benzosultams by the tandem-cyclization of functionalized ynamides with benzotriazoles has been accomplished. This transformation involves the formation of both CN and CC bonds in a single step. Donor solvents appear to enhance the yields of the products. The methodology is also applicable for the generation of triazole/tetrazole
Pd-catalysed intramolecular transformations of indolylbenzenesulfonamides: <i>ortho</i>-sulfonamido-bi(hetero)aryls <i>via</i> C2-arylation and polycyclic sultams <i>via</i> C3 arylation
作者:Rajnikanth Sunke、Shabbir Ahmed Khan、K. C. Kumara Swamy
DOI:10.1039/d2ob01610a
日期:——
Palladium-catalysed and base-dependent intra-molecular ipso-substitution and cyclisation strategies involving N-indolyl-substituted aryl-sulfonamides for the rapid construction of 2-aryl indole and indole-fused six-membered sultams are described. The Pd(OAc)2/Ph3P/Et3N combination delivers indolyl C2 arylated motifs via C(2)–N bond cleavage followed by C–C bond formation. In sharp contrast to this, the Pd(OAc)2/Ph3P/K2CO3