One-Pot Synthesis of 3-Methyl-2-arylimidazo[1,2-<i>a</i>]pyridines Using Calcium Carbide as an Alkyne Source
作者:Wei Chen、Zheng Li
DOI:10.1021/acs.joc.1c01877
日期:2022.1.7
An efficient method for the construction of 3-methyl-2-arylimidazo[1,2-a]pyridines from the reactions of calcium carbide, 2-aminopyridines, and aromatic aldehydes is described. The notable advantages for this strategy include the use of an inexpensive and concise solid alkyne source, cheap and readily available raw materials, wide-scope substrates, and a simple work-up procedure.
描述了一种由电石、2-氨基吡啶和芳香醛反应构建 3-甲基-2-芳基咪唑并[1,2- a ] 吡啶的有效方法。该策略的显着优势包括使用廉价且简洁的固体炔烃源、廉价且容易获得的原材料、广泛的底物和简单的后处理程序。
Novel one-pot pseudo four component reaction: expeditious synthesis of functionalized imidazo[1,2-a]pyridines
作者:Haleh Sanaeishoar、Roya Nazarpour、Fouad Mohave
DOI:10.1039/c5ra10891h
日期:——
A new and efficient one-pot synthesis of imidazo[1,2-a] pyridines is described. A C-3 imine substituent was installed on the imidazopyridine framework under mild conditions to form the corresponding products in good to excellent yields.
A direct synthesis of carbaldehydes through intramoleculardehydrogenativeaminooxygenation has been developed. The process uses a catalytic amount of copper(II) in DMF or DMA under oxygen and does not require additional oxidants (see scheme). Mechanistic studies suggest that the carbonyl oxygen atom of the aldehyde is derived from oxygen through a copper‐mediated oxygen activation process via a peroxy–copper(III)
The present report highlights a magnetic nano-Fe3O4–KHSO4·SiO2 catalyzedsynthesis of imidazo[1,2-a]pyridines. The synthetic strategy adopted is expedient, versatile, and offers good to excellent yields from readily available starting materials.
Monomeric silica supported interaction of
<scp>TOSMIC</scp>
with highly functionalized imines: A green approach to azetidines via
<scp>ABB</scp>
‐type cycloaddition reaction
The reaction of TOSMIC with highlyfunctionalizedimines has been reported. The use of monomericsilica as a catalyst for the reaction has been reported for the first time. The main product of the reported green methodology, formed by the sequential attack of the two TOSMIC units upon the carbon–nitrogen double bond of highlyfunctionalizedimines, has been identified as bis(tosylmethyl)azetidine, a