Intramolecular heterocyclization and cyclopalladation of selenoanisole substituted propargyl imines: Synthesis and reactivity of Pd–C bond towards alkynes
摘要:
The intramolecular cyclization of o-SeMeC6H4C CC-(CF3)(=NAr) with [PdCl2(PhCN)(2)] to dimeric cyclopalladated benzoselenophene has been developed under mild conditions. The reactivity of the new dimeric cyclopalladated benzoselenophene is examined towards insertion of alkynes into Pd-C bond. The reactivity study is also extended to Pd-C bond of dimeric cyclopalladated benzothiophenes towards insertion of alkynes. (C) 2014 Elsevier B. V. All rights reserved.
Cascade Annulation of 2-Alkynylthioanisoles with Unsaturated α-Bromocarbonyls Leading to Thio-Benzobicyclic Skeletons
摘要:
A protocol of Cu-catalyzed annulation of phenylethynylsulfanes with unsaturated alpha-bromocarbonyls for the construction of thio-benzobicyclic skeletons is described. In this single reaction, three new bonds and two new rings can be established, highlighting the step-economics and high efficiency of this protocol.
作者:D. Shankar、K. Jaipal、B. Sridhar、R. Nagarjuna Chary、S. Prabhakar、L. Giribabu、Pravin R. Likhar
DOI:10.1039/c4ra17066k
日期:——
platinum(IV) complex having an octahedral structure with one annulated heterocycle coordinated in a plane and another out of the plane. The formation of platinum(IV) complex 2a, confirmed by analysis of its X-ray crystal structure, follows simultaneous cyclization and oxidative addition of methyl chloride generated during the cyclization. The emission and reactivity studies of platinum(IV) complexes are discussed
Synthesis and functionalization of 3-bromo-2-(2-chlorovinyl)benzothiophenes as molecular tools
作者:Guangkuan Zhao、Mouad Alami、Olivier Provot
DOI:10.1039/c7ra07340b
日期:——
to the synthesis of 3-bromo-2-(2-(di)chlorovinyl)benzothiophene as a polyhalogenated platform. Various arylations on the C3 atom of such di-substituted benzothiophenes and further functionalizations at the chlorine atoms of the benzothiophenes afforded efficient and rapid access to a small library of stereo-defined 2,3-disubstituted benzothiophenes.
A highly selective synthesis of six different fused tetracyclicheterocycles from readily available diarylalkynes and isocyanides is disclosed. It has high step economy and good functional tolerance. An unprecedented intermolecular nucleopalladation of diarylalkynes occurs enabled by a sequential double isocyanide insertion.
Heck-type coupling of intramolecularly-generated thiopalladacycles with alkenes: One pot syntheses of 3-alkenylbenzo[b]thiophenes
作者:Manjusha V. Karkhelikar、Shailesh S. Racharlawar、Subhas M. Salian、B. Sridhar、Pravin R. Likhar
DOI:10.1016/j.jorganchem.2012.02.009
日期:2012.6
A method for stoichiometric functionalization of benzothiophene is developed by Heck-type coupling of alkenes with intramolecularly-generated thiopalladacycles obtained from palladium salts and ortho-thioanisole-substituted propargyl imines. The synthetic strategy for preparing structurally diverse 3-alkenylbenzo[b]thiophene is also extended to 3-alkenylbenzo[b]selenophenes. (C) 2012 Elsevier B. V. All rights reserved.