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
One-Pot Synthesis of Triazolothiadiazepine 1,1-Dioxide Derivatives via Copper-Catalyzed Tandem [3+2] Cycloaddition/N-Arylation
作者:Deepak Kumar Barange、Yu-Chen Tu、Veerababurao Kavala、Chun-Wei Kuo、Ching-Fa Yao
DOI:10.1002/adsc.201000465
日期:2011.1.10
A practical and efficient synthesis of triazolothiadiazepine‐1,1‐dioxide derivativesvia copper‐catalyzed [3+2] cycloaddition, followed by N‐arylation is described. The method is also applicable to the synthesis of indoline‐ and thiophene‐fused triazolothiadiazepine 1,1‐dioxide derivatives.
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
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