Straightforward microwave-assisted synthesis of 2-thiazolines using Lawesson's reagent under solvent-free conditions
作者:Julio A. Seijas、M. Pilar Vázquez-Tato、José Crecente-Campo
DOI:10.1016/j.tet.2008.07.027
日期:2008.9
2-Thiazolines are synthesized from carboxylic acids and 1,2-aminoalcohols in the presence of Lawesson's reagent under solventless conditions. The developed method is valid for either substituted or unsubstituted aminoalcohols and a wide variety of aromatic, heteroaromatic and aliphatic carboxylic acids; thus it constitutes a general synthetic method for these kinds of compounds. The role of Lawesson's
Trichloroisocyanuric acid as an efficient homogeneous catalyst for the chemoselective synthesis of 2-substituted oxazolines, imidazolines and thiazolines under solvent-free condition
作者:Fatemeh Hojati、Atefe Nezhadhoseiny
DOI:10.2298/jsc111031028h
日期:——
Trichloroisocyanuric acid, as a commercially available and inexpen- sive catalyst, was used in a new, facile and efficient procedure for the synthesis of 2-oxazolines, 2-imidazolines and 2-thiazolines through the reaction of nitriles with 2-aminoethanol, ethylenediamine or 2-aminoethanеthiol under solvent-free conditions.
The present invention relates to compounds of the formulae I and Ia,
wherein R0 ; R1 ; R2 ; R3 ; R4; R22, Q; V, G and M have the meanings indicated in the claims. The compounds of the formulae I and Ia are valuable pharmacologically active compounds. They exhibit a strong antithrombotic effect and are suitable for the therapy and prophylaxis of cardiovascular disorders like thromboembolic diseases or restenoses. They are reversible inhibitors of the blood clotting enzymes factor Xa (FXa) and/or factor VIIa (FVIIa), and can in general be applied in conditions in which an undesired activity of factor Xa and/or factor VIIa is present or for the cure or prevention of which an inhibition of factor Xa and/or factor VIIa is intended. The invention furthermore relates to processes for the preparation of compounds of the formulae I and Ia, their use, in particular as active ingredients in pharmaceuticals, and pharmaceutical preparations comprising them.
Cu(II) immobilized on Fe$_{3}$O$_{4}$@Agarose nanomagnetic catalyst functionalized with ethanolamine phosphate--salicylaldehyde Schiff base: a magnetically reusable nanocatalyst for preparation of 2-substituted imidazolines, oxazolines, and thiazolines
作者:Zeinab ZAREI、Batool AKHLAGHINIA
DOI:10.3906/kim-1704-53
日期:——
Herein we synthesized Cu(II) immobilized on Fe$_3}$O$_4}$ @Agarose functionalized with ethanolamine phosphate salicylaldehyde Schiff base (Fe$_3}$O$_4}$ @Agarose/SAEPH$_2}$ /Cu(II)) as a new and cost-effective nanomagnetic catalyst. The nanomagnetic catalyst was characterized by FT-IR, XRD, VSM, SEM-EDX, TEM, TGA, and ICP techniques and it was found that the particles were about 9-25 nm in size
Tribromomelamine: A Novel and Efficient Catalyst for the Synthesis 2-Arylthiazolines under Solvent-free Conditions
作者:Liqiang Wu
DOI:10.1155/2012/972109
日期:——
A novel procedure for the synthesis of 2-arylthiazolines through one-pot condensation of of nitriles with 2-aminoethanethiol in the presence of tribromomelamine as catalyst under solvent-free conditions is described.