Synthesis of new enantiomerically pure β-amino alcohols of the pinane series
摘要:
A series of new beta-amino alcohols with pinane structure, (+)- and (aEuro')-3 alpha-amino-10 beta-pinan-4 beta-ols, 4 beta-amino-10 beta-pinan-3 alpha-ol, and 4 alpha-amino-10 beta-pinan-3 alpha-ol have been synthesized with the goal of using them as organocatalysts in the aldol reaction of isatin with acetone.
Synthesis of new enantiomerically pure β-amino alcohols of the pinane series
摘要:
A series of new beta-amino alcohols with pinane structure, (+)- and (aEuro')-3 alpha-amino-10 beta-pinan-4 beta-ols, 4 beta-amino-10 beta-pinan-3 alpha-ol, and 4 alpha-amino-10 beta-pinan-3 alpha-ol have been synthesized with the goal of using them as organocatalysts in the aldol reaction of isatin with acetone.
New monoterpene-derived phosphinopyridine ligands and their application in the enantioselective iridium-catalyzed hydrogenation
作者:Giorgio Chelucci、Mauro Marchetti、Andrei V. Malkov、Frédéric Friscourt、Martin E. Swarbrick、Pavel Kočovský
DOI:10.1016/j.tet.2011.05.075
日期:2011.7
derivatives with a phosphine or phosphinite pendant (1–11) have been synthesized from (+)-α-pinene, (−)-isopinocampheol, and/or (+)-camphor via Kröhnke annulation or another annulation method as the key step for the construction of the pyridine nucleus. The iridium complex of 6 proved to catalyzehydrogenation of the prochiral unfunctionalized alkene 44 with 94% ee, whereas the complex of 2 was most efficient
The oxidation of organiccompounds with carbon-carbon double bond with molecular oxygen under atmospheric pressure in the presence of new polyaniline supported catalyst 1 has been studied. This catalyst turned out to be efficient and selective for oxidation of some unsaturatedorganiccompounds. Oxidation of alkenes, cycloalkenes and terpenes give corresponding epoxy derivatives, whereas organic compounds
Synthesis of regiospecifically substituted quinolines from anilines
作者:Giorgio Chelucci、Ilaria Manca、Gerard A. Pinna
DOI:10.1016/j.tetlet.2004.12.020
日期:2005.1
A protocol for the synthesis of quinolines substituted on both pyridine and benzo-fused rings is reported. The method is based on the formylation of a substituted N-(tert-butoxycarbonyl)aniline followed by direct cyclisation and aromatisation of the intermediate product obtained by condensation of the formed N-Boc o-aminobenzaldehyde with an enolisable carbonyl compound. Yields up to 88% have been
We present here a new class of Nb-containing catalysts offering both acid and base functionalities thanks to the hydroxyapatite (HAP) structure, which acts as a host matrix for guest niobium species. Incorporation of Nb has led to samples with strengthened amphoteric properties with a prevalence of acid or basic sites depending on the synthesis procedure. Nb-containing HAP samples (12-14 wt % of Nb) have been synthesized by coprecipitation in water and in alcoholic solutions and by impregnation starting from different precursors. The intrinsic and effective acid and base properties have been measured, and a series of mass and surface characterizations have been performed to determine the Nb content, its oxidation state as well as its morphologic, structural, and electronic properties. The performances of the samples have been studied in several reactions of liquid solid heterogeneous catalysis in batch or fixed tubular reactors working in the recirculation mode on the basis of the known catalytic features of Nb, including hydrolysis, acid-catalyzed isomerization, and selective oxidation reactions.