Triethylammonium acetate (TEAA): a recyclable inexpensive ionic liquid promotes the chemoselective aza- and thia-Michael reactions
作者:Akhilesh K. Verma、Pankaj Attri、Varun Chopra、Rakesh K. Tiwari、Ramesh Chandra
DOI:10.1007/s00706-008-0886-4
日期:2008.9
A new, highlyefficient, inexpensive, recyclable, mild, convenient, and green protocol for chemoselective aza/thia- Michaeladdition reactions of amines/thiols to α,β - unsaturated compounds using triethylammonium acetate ( TEAA ) ionic liquid was developed. The catalyst can be recycled ten times and obviate the need for toxic and expensive catalysts.
We report the design, synthesis, and evaluation of a series of novel cyclopentadienyltricarbonyl 99mTc complexes as potent σ1 receptor radioligands. Rhenium compounds 3-(4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl)propylcarbonylcyclopentadienyl tricarbonylrhenium (10a) and 4-(4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl)butylcarbonylcyclopentadienyl tricarbonylrhenium (10b) possessed high in vitro
Single-walled Carbon Nanotube-triethylammonium Ionic Liquid as a New Catalytic System for Michael Reaction
作者:Pankaj Attri、Eun Ha Choi、Gi-Chung Kwon、Rohit Bhatia、Jitender Gaur、Bharti Arora、In Tae Kim
DOI:10.5012/bkcs.2014.35.10.3035
日期:2014.10.20
A new efficient catalytic method for aza/thia-Michael addition reactions of amines/thiols with higher product yields has been developed. Combining single-walled carbon nanotubes (SWCNT) with triethylammonium hydrogen phosphate (TEAP) ionic liquid (IL) can work as a catalyst. We utilized Raman spectroscopy to gain insight into the interactions between IL and SWCNT. The interactions between SWCNT with TEAP were confirmed by the increasing intensity ratios and spectral shift in wavelength of the Raman D and G bands of SWCNT. Further, the morphology of the resulting composite materials of TEAP and SWCNT was determined by using scanning electron microscopy (SEM). Higher product yield in reduced reaction time is the key advantage of using bucky gel as a catalyst for Michael reaction.