Thermal cyclization of 1,2-dialkynylimidazoles to imidazo[1,2-a]pyridines
摘要:
Thermolysis of 1,2-dialkynylimidazoles in chlorinated solvents leads to 5-chloroimidazo[1,2-a]-pyridine products, which are also formed in DMF containing 1 equiv of HCI. Deuterium labeling of the starting dialkynylimidazoles indicates that reaction may proceed by multiple pathways, depending upon conditions and substituents. Dialkynylimidazoles can also give rise to 5-diethylamino-substituted imidazopyridines when the thermolysis is carried out in the presence of diethylamine. (c) 2006 Elsevier Ltd. All rights reserved.
Pd/Al 2 O 3 -catalysed regioselective N -1-modification of benzotriazoles using iodonium salts
作者:Dmitry V. Davydov、Yurii F. Oprunenko、Irina P. Beletskaya
DOI:10.1016/j.tetlet.2017.10.033
日期:2017.11
The Pd/Al2O3-catalysed N-modification of symmetrically substituted benzotriazoles using diaryl-, alkenyl- and ethynyliodonium salts took place regioselectively at the N-1-position of the benzotriazole ring.
使用二芳基-,烯基-和乙炔基碘鎓盐的对称取代的苯并三唑的Pd / Al 2 O 3催化的N-修饰在苯并三唑环的N -1位区域选择性地发生。
Convenient and efficient synthesis of functionalized unsymmetrical alkynyl sulfides
We developed a simple and efficient method for the synthesis of functionalized unsymmetrical alkynyl sulfides under mild conditions in good yields. The designed method is based on the reaction of 5,5-dimethyl-2-thioxo-1,3,2-dioxaphosphorinan-2-disulfanyl derivatives with lithium acetylides. The developed method allows the preparation of unsymmetrical alkynyl sulfides bearing additional hydroxyl, carboxyl
Modular Synthesis of Multisubstituted Furans through Palladium-Catalyzed Three-Component Condensation of Alkynylbenziodoxoles, Carboxylic Acids, and Imines
作者:Junliang Wu、Naohiko Yoshikai
DOI:10.1002/anie.201504687
日期:2015.9.14
regiocontrolled synthesis of a multisubstitutedfuran is achieved through Pd(OAc)2‐catalyzed room‐temperature condensation of an alkynylbenziodoxole, a carboxylicacid, and an enolizable ketimine, which contribute to C1, CO, and C2 fragments, respectively, to the furan skeleton. The reaction tolerates a broad range of functional groups in each of the reaction components, and enables highly modular and flexible
Improving alkynyl(aryl)iodonium salts: 2-anisyl as a superior aryl group
作者:David J. Hamnett、Wesley J. Moran
DOI:10.1039/c4ob00556b
日期:——
majority of alkynyl(aryl)iodoniumsalts reported in the literature are derived from iodobenzene. This article describes the effects of varying this iodoarene building block on the synthesis, reactivity and stability of these salts. Two procedures to synthesize a variety of known and novel alkynyl(aryl)iodoniumtosylates directly from the iodoarene are reported. In the reactions of these salts, those derived
Synthesis of a Range of Iodine(III) Compounds Directly from Iodoarenes
作者:Eleanor A. Merritt、Berit Olofsson
DOI:10.1002/ejoc.201100360
日期:2011.7
The first direct synthesis of an alkynyl(phenyl)iodonium salt from iodobenzene and an unprotected alkyne is described. The synthesis of the corresponding alkenyl(phenyl)iodonium salt is achieved from the TMS-alkyne, simply by means of changing the solvent. The one-pot synthesis of 1-arylbenziodoxolones and other iodine(III) compoundsfromiodine(I) precursors is also presented.