Rhodium(II) catalyzed highly diastereoselective synthesis of conformationally restricted dispiro[1,3-dioxolane]bisoxindoles
作者:Sengodagounder Muthusamy、Rajagopal Ramkumar
DOI:10.1016/j.tet.2014.06.085
日期:2014.9
Synthesis of conformationally restricted dispiro- and bis-dispiro-1,3-dioxolanes via three-component reaction of diazoamides, ketoamides/diketones, and aromatic/heteroaromatic aldehydes in the presence of rhodium(II) acetate dimer catalyst at room temperature involving carbonyl ylides is demonstrated with diastereoselectivity. Synthesis of macrocyclic dispiro-1,3-dioxolanes via intramolecular carbonyl
Rhodium(<scp>ii</scp>) catalyzed synthesis of macrocycles incorporating oxindole via O–H/N–H insertion reactions
作者:Sengodagounder Muthusamy、Thangaraju Karikalan
DOI:10.1039/c4ob01671h
日期:——
an oxindole unit were synthesized in good yield via rhodium(II) acetate dimer catalyzed intramolecular O–H/N–H insertion reactions. Interestingly, synthesis of C2-symmetric macrocycles in moderate yield was also demonstrated via head to tail dimerization involving double intermolecular O–H insertion when the spacer length was decreased. The synthesis of chiral macrocycles was also delineated. This study
challenge to develop a compound containing various photoswitches with spectral complementarity. Herein, we describe a novel multiphotochromic system based on a first generation donor-acceptor Stenhouse adduct (DASA) and an aurone, in which all physicochemical properties of twophotoswitches are preserved and four isomers are selectively reachable with three different wavelengths of light sources (365 nm
Novel thiol-terminated bent-core liquid crystals (LCs) are used to decorate gold nanoparticles. Thioacetate or xanthate/xanthogenate functional groups are used to effect the attachment of the LCs to the gold nanoparticles. Such bent-core decorated nanoparticles may be dissolved in bent-core liquid crystal host media to provide polarizable systems which respond quickly to applied electric fields and exhibit other interesting and useful optical and electro-optic behaviour.