Novel insights into gold(I) chemistry: from anticancer activity to new synthetic methodologies.

The work herein presented, embraces various aspects of gold chemistry: the documentation of novel [alkynyl(triphenylphosphine)gold(I)] complexes carrying differently substituted propargylic amines and their pharmacological investigation on a series of cancer cell lines and the investigation of the dearomative cycloaddition reaction of indoles with electron-rich allenes catalysed by commercially available gold(I) complexes that show competence in performing the chemo-, regio- and diastereoselective formal [2+2]-cycloaddition between a wide range of substrates under mild conditions. It has also been developed the combined efficiency of Bu4N+ and F− ions in performing a cascade sequence involving intramolecular hydroamination of the C–C triple bond, cleavage of silyl-protecting groups and site-selective sigmatropic aza-Cope-type [3,3]-rearrangement

Graphene Oxide Promotes Site-Selective Allylic Alkylation of Thiophenes with Alcohols

The graphene oxide (GO) assisted allylic alkylation of thiophenes with alcohols is presented. Mild reaction conditions and a low GO loading enabled the isolation of a range of densely functionalized thienyl and bithienyl compounds in moderate to high yields (up to 90%). The cooperative action of the Bronsted acidity, epoxide moieties, and pi-surface of the 2D-promoter is highlighted as crucial in the reaction course of the present Friedel-Crafts-type protocol

New opportunities in the stereoselective dearomatization of indoles

The regio- and stereoselective dearomatization of indoles is realized for the first time by combining readily available indolyl precursors and electron-rich allenes, namely allenamides and aryloxyallenes. Inter- as well as intramolecular condensations were realized under gold and Br\uf8nsted acid catalysis providing a range of densely functionalized indoline and indolenine cores in high yields and excellent stereochemical outcome. Chemodivergent reaction profiles (Micheal-type addition vs. [2 + 2]-cycloaddition) were realized by a tailored design of both reaction conditions and functionalization of the reaction partners

Process for the preparation of alectinib

The present invention relates to a process for preparing alectinib or a pharmaceutically acceptable salt thereof. The present invention also relates to 5 intermediate compounds which are useful in such process and to the preparation of such intermediate compounds. Alectinib is approved as the hydrochloride salt, which is the active ingredient of drug Alecensa® and is intended for oral administration in the form of capsule. It is an anaplastic lymphoma kinase (ALK) inhibitor indicated for the treatment of patients with non-small-cell lung cancer (NSCLC)

Catalytic a-Allylation of Enones with Alcohols via [Gold(I)]- Mediated [3,3]-Sigmatropic Rearrangement of Propargylic Carboxylates

The site-selective a-allylic alkylation of enones with alcohols via gold-triggered formation of nucleophilic allenoates by means of [3,3]-sigma- tropic rearrangements of propargylic carboxylates is reported. A range of a-alkylated enones is obtained in high yields in the presence of the gold complex [JohnPhosAu(ACN)]SbF6 (2 mol%) as the promot- ing agent. Examples of allylation/Friedel\u2013Crafts al- kylation sequences are also provided, delivering densely functionalized dihydroindenes and dihydro- benzo[7]annulenes in a one-pot procedure in mod- erate yields. The role of the Br\uf8nsted acidity (i.e., pivalic acid) delivered during the reaction course in assisting the formation of carbocationic intermedi- ates is documented

Novel iron(iii) catalyst for the efficient and selective coupling of carbon dioxide and epoxides to form cyclic carbonates

Re-cycling carbon dioxide with iron". The synthesis of cyclic organic carbonates in high yield, stereo- and chemo-selectivity was accomplished through the coupling of carbon dioxide and epoxides, catalysed by a novel air-stable and easy-to-handle thioether-triphenolate iron(iii) complex

Stereorigid OSSO-Type Group 4 Metal Complexes in the Ring-Opening Polymerization of rac-Lactide

The synthesis and characterization of a series of group 4 metal complexes of general formula OSSOXM(OR)2 (X = R =tBu, M = Zr (1); X = cumyl, M = Zr, R =tBu (2); X = cumyl, M = Ti, R =iPr (4); X = cumyl, M = Hf, R =tBu (5)) and OSSOX2Zr (X = Cl (3)) supported by o-phenylene-bridged bis(phenolato) ligands (OSSOtBu-H = 6,6′-((1,2-phenylenebis(sulfanediyl))bis(methylene))bis(2,4-di-tert-butyphenol); OSSOCum-H = 6,6′-((1,2-phenylenebis(sulfanediyl))bis(methylene))bis(2,4-bis(2-phenylpropan-2-yl)phenol); OSSOCl-H = 6,6′-((1,2-phenylenebis(sulfanediyl))bis(methylene))bis(2,4-dichlorophenol)) are described herein. Complexes 1-5 were readily obtained by σ-bond metathesis reactions between the proligand and the appropriate homoleptic metal precursor. The reaction with OSSOCl yielded the bis-ligand complexOSSOCl2Zr (3) regardless of the OSSOCl-H/Zr(OtBu)4 molar ratio or experimental conditions. All complexes were characterized in solution using NMR spectroscopy and, in the case of 2, by single-crystal X-ray diffraction experiments. These complexes show a fac-fac ligand wrapping and a cis relationship between the other two monodentate ligands; zirconium and hafnium complexes 1-3 and 5 are configurationally stable, whereas titanium complex 4 is fluxional in solution at room temperature. The complexes tested in the ring-opening polymerization (ROP) of racemic-lactide showed, except in the case of 3, moderate rates and good levels of polymerization control. Upon addition of an exogenous alcohol (isopropyl alcohol or tert-butyl alcohol) efficient binary catalytic systems were achieved. Polymerizations were well-controlled, as testified by the linear growth of the molecular weight as polymerization proceeded, narrow polydispersity indices, and molecular weights close to those expected on the basis of added alcohol amounts. Experimental and theoretical evidence is provided that ROP reactions operate according to an activated monomer mechanism