A highly improved and green methodology for the direct amidation of carboxylic acids with amines using silica gel as a solidsupport and catalyst is described. The scope of this...
描述了使用硅胶作为固体载体和催化剂将羧酸与胺直接酰胺化的高度改进的绿色方法。这个范围...
Highly regioselective, electrophile induced cyclizations of 2-(prop-1-ynyl)benzamides
We report an electrophile promoted, highly regioselective (∼100%) synthesis of 5-membered haloimidiates from 2-(1-alkynyl)benzamides under metal free conditions. The steric bulk in association with neighbouring group assistance at the propargylic carbon of an alkyne has been employed as the dictating factor to achieve the regioselectivity. A very broad structural diversity has been observed for propargylic
Copper-catalyzed tandem aryl–halogen hydroxylation and CH<sub>2</sub>Cl<sub>2</sub>-based N,O-acetalization toward the synthesis of 2,3-dihydrobenzoxazinones
作者:Xuwen Chen、Wenyan Hao、Yunyun Liu
DOI:10.1039/c7ob00625j
日期:——
The concise synthesis of 2,3-dihydro-4H-benzo[e][1,3]oxazin-4-ones has been accomplished by copper-catalyzedtandemreactions of o-halobenzamides, LiOH and dichloromethane. The aryl–halogen bond hydroxylation and subsequent N,O-acetalization on CH2Cl2 are enabled under catalytic conditions which allows the generation of C(sp2)–O, C(sp3)–O and C(sp3)–N bonds to give the target products.
Abstract Indoles, dihydroisoquinolines, and dihydroquinolines were efficiently prepared by ruthenium-catalyzed heterocyclizations of aromatic homo- and bis-homopropargyl amines/amides in the presence of an amine/ammonium base-acid pair. These regioselective 5-endo and 6-endo cyclizations most probably occur by nucleophilic trapping of key ruthenium-vinylidene intermediates. Indoles, dihydroisoquinolines
Phenylselanyl Group Incorporation for “Glutathione Peroxidase-Like” Activity Modulation
作者:Magdalena Obieziurska-Fabisiak、Agata J. Pacuła、Lucia Capoccia、Joanna Drogosz-Stachowicz、Anna Janecka、Claudio Santi、Jacek Ścianowski
DOI:10.3390/molecules25153354
日期:——
The ability of organoselenium molecules to mimic the activity of the antioxidant selenoenzyme glutathioneperoxidase (GPx) allows for their use as antioxidant or prooxidant modulators in several diseases associated with the disruption of the cell redox homeostasis. Current drug design in the field is partially based on specific modifications of the known Se-therapeutics aimed at achieving more selective