Metal silicates: efficient catalysts for the three-component preparation of 2-amino-5-oxo-4-aryl-4,5-dihydroindeno[1,2-b]pyran-3-carbonitrile derivatives

Abstract

A highly efficient catalytic preparation of 2-amino-5-oxo-4-aryl-4,5-dihydroindeno[1,2-b]pyran-3-carbonitrile derivatives using different metal silicates was developed through a three-component reaction of malononitrile, aromatic aldehydes, and 1,3-indandione in high yields.

In Situ Formation of Li2SiO3-Li-NaCl Interface on Si and Its Effect on Hydrogen Evolution

“…Moreover, based on the high solubility of NaCl ( S = 36.3 g/100 g of H 2 O at 30 °C) and the high chemical activity of Li metal with water, it is believed that the NaCl and Li metal in the interface would be dissolved simultaneously during the hydrolysis operation. In addition, the local huge heat produced by the reaction of Li + H 2 O → LiOH + 1/2 H 2 (△ G 298 K = 189.2 kJ mol –1 ) could promote the dissolution of Li 2 SiO 3 , because the solubility of solid Li 2 SiO 3 is low in cold water and could be promoted by improving the temperature. , …”

“…The signals of 7 Li ion, 28 Si 16 O 3 cluster, 23 Na ion, and 35 Cl ion for the M-Si hydrolyzed at 0.5 min are also absent or obviously weak in the TOF-SIMS spectra, as shown in Li 2 SiO 3 is low in cold water and could be promoted by improving the temperature. 31,32 Ex situ XPS and SEM were carried out to investigate the surface state and morphology of the hydrolyzed modified Si at different reaction times. Figure 6 record the Li 1s and Si 2p XPS spectra of the hydrolyzed M-Si at different reaction times.…”

Importance of laboratory experimental studies of silicate grains for exoplanet atmosphere characterization

“…It is worth mentioning the study of the role of porous silica environments in prebiotic organic transformations, especially from amino acids to peptides to proteins, on the early Earth (Navrotsky et al, 2021) and studies of the formation of organic compounds in meteorites (acting as catalysts) at high temperatures (Anders et al, 1973;Rotelli et al, 2016). There are also chemical applications of the catalytic properties of silicate materials at high temperatures (e.g., (Fazlinia and Sheikh, 2018;Ramanathan and Subramaniam, 2018;Bawaked and Narasimharao, 2020)). However, their relation to astrochemical processes is not always direct and needs careful investigation.…”

Preparation of skeletally diverse quinazoline-2,4(1H,3H)-diones using Na2SiO3/SnFe2O4 catalytic system through a four-component reaction

“…Sodium silicate has been used for the acceleration of numerous organic transformations such as biodiesel production (Guo et al, 2010), production of lactic acid from rapeseed oil (Long et al, 2011), transesterification of soybean oil to biodiesel (Guo et al, 2012), transesterification of waste cooking oil to biodiesel (Daramola et al, 2015), preparation of Pyrano [2,3-d] pyrimidine derivatives (Abaszadeh et al, 2019), synthesis of pyrano[2,3-d] pyrimidines (Sheikhan-Shamsabadi and Ghashang, 2017), preparation of 2-amino-5-oxo-4-aryl-4,5-dihydroindeno[1,2-b] pyran-3-carbonitriles (Fazlinia and Sheikh, 2018), preparation of Pyrido[2,3-b]indoles (Sheikh and Fazlinia, 2018).…”