نتایج جستجو برای: tertiary amine

تعداد نتایج: 101914  

2011
Yurii S. Moroz Michael K. Takase Peter Müller Elena V. Rybak-Akimova

The title compound, C(30)H(42)N(4), is an aryl-ated tris-(amino-eth-yl)amine derivative which was obtained by reducing the corresponding tris-amide with AlH(3). The asymmetric unit consists of one third of a C(3v)-symmetric mol-ecule with the tertiary N atom lying on a crystallographic threefold axis.

Journal: :Chemical communications 2015
Wei Zhao Yves Gnanou Nikos Hadjichristidis

By associating primary (slow but controlled ring-opening polymerization; ROP) and tertiary (fast but uncontrolled ROP) amines in the same molecule, a novel highly active organocatalytic system proceeding by an accelerated amine mechanism through monomer activation (AAMMA) and leading to living ROP of α-amino acid N-carboxyanhydrides at room temperature was successfully developed.

Journal: :Journal of agricultural and food chemistry 1975
W J Hsu S M Poling C DeBenedict C Rudash H Yokoyama

Fourteen triethylamine derivatives including the 2-(4-chlorophenylthio)triethylamine (CPTA) were all found to be effective in inducing the formation of lycopene in Marsh white seedless grapefruit (Citrus paradisi, Rutaceae); however, they differed in the degree of effectiveness. The structural feature necessary for inducer activity appeared to be the tertiary alkylamine. Compounds with an S ato...

Journal: :Organic letters 2012
Santosh Agrawal Maud Lenormand Belén Martín-Matute

A readily available pincer ruthenium(II) complex catalyzes the selective monoalkylation of (hetero)aromatic amines with a wide range of primary alcohols (including pyridine-, furan-, and thiophene-substituted alcohols) with high efficiency when used in low catalyst loadings (1 mol %). Tertiary amine formation via polyalkylation does not occur, making this ruthenium system an excellent catalyst ...

Journal: :Organic & biomolecular chemistry 2013
Xiaowei Dou Yixin Lu

An organocatalytic conjugate addition of prochiral 3-fluorinated oxindoles to vinyl sulfones was described for the first time. In the presence of bifunctional tertiary amine-thiourea catalysts, 3-fluoro-3-substituted oxindole adducts were obtained in excellent yields and with high enantiomeric excesses.

Journal: :Organic & biomolecular chemistry 2014
Yulong Liu Xie Wang Xiaoyun Wang Wei He

Chalcones are still challenge substrates in Michael reactions, and only limited success has been achieved. This work describes a highly enantioselective Michael addition of diethyl malonate with chalcones catalyzed by cinchona alkaloids-derivatived bifunctional tertiary amine-thioureas bearing multiple hydrogen-bonding donors.

Journal: :Chemical communications 2011
Masato Ito Akira Shiibashi Takao Ikariya

A Cp*Ru-based bifunctional catalyst system (Cp* = η(5)-C(5)(CH(3))(5)) with a suitably-designed PN ligand (PN = chelating tertiary phosphine-protic amine ligand) has been developed for a regioselective lactonization of unsymmetrically substituted 1,4-diols, which may provide an expeditious access to a variety of lactone lignans.

2016
Shuai Qiu Choon-Hong Tan Zhiyong Jiang

A dipeptide-based urea-amide tertiary amine (DP-UAA) was shown to be an effective Brønsted base catalyst for the first asymmetric annulation reaction between 5H-thiazol-4-ones and N-itaconimides. High levels of enantioselectivity (up to 99% ee) and diastereoselectivity (>19:1 dr) were obtained for a series of spirocyclic 1,4-sulfur-bridged piperidinone-based succinimides.

Journal: :Journal of the American Chemical Society 2015
Jennifer M Howell Kaibo Feng Joseph R Clark Louis J Trzepkowski M Christina White

Nitrogen heterocycles are ubiquitous in natural products and pharmaceuticals. Herein, we disclose a nitrogen complexation strategy that employs a strong Brønsted acid (HBF4) or an azaphilic Lewis acid (BF3) to enable remote, non-directed C(sp(3))-H oxidations of tertiary, secondary, and primary amine- and pyridine-containing molecules with tunable iron catalysts. Imides resist oxidation and pro...

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