A catalytic system comprised of Pd(OAc)2 and bidentate ligand dppe enabled first direct arylations with moisture-stable aryl sulfamates as electrophiles, and proved applicable to unprecedented C−H bond functionalizations with easily accessible alkenyl phosphates as well as benzyl phosphates.
Microwave-assisted one-pot synthesis of benzothiazole and benzoxazole libraries as analgesic agents
作者:C PRAVEEN、A NANDAKUMAR、P DHEENKUMAR、D MURALIDHARAN、P T PERUMAL
DOI:10.1007/s12039-012-0251-3
日期:2012.5
Microwave-assisted synthesis of benzothiazole and benzoxazole libraries via PIFA promoted cyclocondensation of 2-aminothiophenols/2-aminophenols with aldehydes under one-pot condition in good to excellent yields was achieved. Twenty compounds have been investigated for their analgesic activity and showed moderate to good activity.
Copper(II)-diaminosarcophagine-functionalized SBA-15: a heterogeneous nanocatalyst for the synthesis of benzimidazole, benzoxazole and benzothiazole derivatives under solvent-free conditions
over periodic mesoporous silica (SBA‐15) containing a Cu(II) organometallic complex. This heterogeneous catalyst was achieved by coordination of Cu(II) ions with the diaminosarcophagine ligand and then its grafting onto the surface of SBA‐15. This catalyst displayed ordered mesoporous channels, which implies an extremely high dispersion of the Cu(II) complex and the convenient diffusion of reactant molecules
Simple and efficient protocol for the synthesis of benzoxazole, benzoimidazole and benzothiazole heterocycles using Fe(III)–Schiff base/SBA-15 as a nanocatalyst
Abstract Benzimidazoles, benzoxazoles, and benzothiazolesderivatives were synthesized from condensation of aldehydes and 1,2-phenylenediamine or ortho -aminophenol or ortho -aminothiophenol in the presence of catalytic amount of Fe(III)–Schiff base/SBA-15 in water medium. Short reaction times, good to excellent yields, easy availability, reusability, and use of an eco-friendly catalyst are some of
Sulfur-Promoted Synthesis of Benzoxazoles from 2-Aminophenols and Aldehydes
作者:Le Anh Nguyen、Thai Duy Dang、Quoc Anh Ngo、Thanh Binh Nguyen
DOI:10.1002/ejoc.202000523
日期:2020.7.7
Oxidation with sulfur: Elemental sulfur (S8) was found to be an excellent stoichiometric oxidant to promote oxidative condensation of 2‐aminophenols with a wide range of aldehydes to provide benzoxazoles.