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CYCLIZATION PROCEDURES TOWARD THE SYNTHESIS OF SOME CONFORMATIONALLY RESTRICTED NITROGEN HETEROCYCLES
(Sociedad Chilena de Química, 2002)
Recent applications of microwave assisted cyclizations promoted by polyphosphoric acid esters to the synthesis of nitrogen heterocycles
(Wiley Blackwell Publishing, Inc, 2020)
Polyphosphoric acid (PPA) esters PPE (ethyl polyphosphate) and PPSE (trimethylsilyl polyphosphate) are mild reagents of the Lewis acid type with a high dehydrating power due to their ability to react irreversibly with ...
Advances in metal-mediated solid-phase synthesis of heterocyclic compounds
(Springer, 2017)
While heterocycles are a key feature frequently found in compounds with pharmaceutical or agrochemical interest, the combination between solidsupported synthesis and organometallic chemistry has demonstrated to be a helpful ...
Synthesis of some C-3,4,5-substituted 2,6-dimethyl-1,4-dihydropyridines (4-DHPs)
(TAYLOR & FRANCIS INC, 2007)
A series of C-3,4,5-substituted 2,6-dimethyl-1,4-dihydropyridines ( 1,4-DHPs) with pharmacological properties were prepared by a variation from the classical Hantzsch synthesis. The procedure involves treatment of the ...
Gold-Catalyzed Cycloisomerization of Alkyne-Containing Amino Acids: Controlled Tuning of C–N vs. C–O Reactivity
(Wiley VCH Verlag, 2016-06)
Versatile alkyne-containing amino acids were used as ambident precursors in the divergent synthesis of alkylidenelactones and 1-pyrrolines. Two gold-catalyzed protocols were applied for selective intramolecular O- and ...
Synthesis of optically active 1,2,3-trisubstituted azetidines employing an organocatalytic approach with L-proline
(Elsevier, 2013-01-30)
A concise organocatalytic approach towards optically active 1,2,3-trisubstituted azetidines, including a study of the scope and limitations of the synthetic sequence, is reported. The synthesis comprises the one-pot ...
New atropisomers derived from amidinoquinoxaline N-oxides: Synthesis and NMR characterization
(Elsevier Science, 2010-10)
The complete 1H and 13C NMR characterization of some representative examples of five and six-membered amidinoquinoxaline N-oxides 1 with dissymmetric aryl substituents and their methiodides 2 is reported. Compounds 1 were ...
SYNTHESIS, CHARACTERIZATION AND PRELIMINARY CATALYTIC PROPERTIES OF NEW COPPER (I) COMPLEXE [Cu (pyrazolyl)2]X TYPE
(Sociedad Chilena de Química, 2010)
Microwave-Assisted Synthesis of 2-Aryl-2-oxazolines, 5,6-Dihydro-4H-1,3-oxazines, and 4,5,6,7-Tetrahydro-1,3-oxazepines
(American Chemical Society, 2016-12)
The first general procedure for the synthesis of 5- to 7-membered cyclic iminoethers by microwave-assisted cyclization of ω-amido alcohols promoted by polyphosphoric acid (PPA) esters is presented. 2-Aryl-2-oxazolines and ...
Total Synthesis and Cytotoxic Activity of 6,8-Dimethoxy-1,3-dimethylisoquinoline Isolated from Ancistrocladus tectorius: A 6π-Azaelectrocyclization Approach
(Georg Thieme Verlag Kg, 2019-01)
A facile and convenient approach toward the total synthesis of 1,3-dimethyl-6,8-dimethoxyisoquinoline from phloroacetophenone is reported. The sequence entailed the selective 2,4-di-O-methylation and further triflation of ...