A Simple and Efficient [(n-Bu₃Sn)₂MO₄]_nCatalyzed Synthesis of Quinazolinones and Dihydroquinazolinones

Facile One-Pot Preparation of Organotin-Oxometalate Polymers for Efficient Synthesis of Dimethyl Carbonate from CO2

“…FT-IR spectra of the organometallic coordination polymers are shown in Figure A. (Me 3 Sn) 2 MoO 4 showed a very strong absorption peak at 850 cm –1 , and similar absorption peaks were also observed for (Et 3 Sn) 2 MoO 4 , ( n Pr 3 Sn) 2 MoO 4 , ( n Bu 3 Sn) 2 MoO 4 , and (Cy 3 Sn) 2 MoO 4 at around 832, 836, 815, and 805 cm –1 , which were related to the asymmetric vibration of [MoO 4 ] 2– units. ,, Besides, the corresponding absorption peaks at 552, 591, 601, 611, and 650 cm –1 were assigned to the bending stretching vibration of the Sn–C group in the studied coordination polymers, respectively. For all the samples, the broad absorption peaks in the range of 2844–2997 cm –1 were associated with the symmetric and asymmetric stretching vibrations of C–C and C–H groups, and the other vibration peaks observed at 995–1629 cm –1 were due to the various organic and metal organic functional groups present in the coordinated polymers. , …”

“…However, when a physical mixture of Bu 3 SnCl and Na 2 MoO 4 •2H 2 O was used as a catalyst, the DMC yield and TON were very low, suggesting that the integration of [MoO 4 ] 2− and [Bu 3 Sn] + groups could improve the catalytic activity remarkably and a good synergistic effect was likely to appear between the two groups. 28,41 In terms of the DMC yield, the performance of the catalysts followed the order (nBu 3 Sn the highest activity, indicating that more acidic-basic sites were conducive to improving the catalytic performance, as several studies have revealed that the acidic-basic sites played a vital role in the catalytic activity. 25,26 However, for (Cy 11), the decrease in activity mainly resulted from the serious steric hindrance of the ring group, which reduced the interactions of the active center of the catalyst with the reactants.…”

“…= TON Amount of DMC Amount of active sites in added catalyst units. 28,32,33 Besides, the corresponding absorption peaks at 552, 591, 601, 611, and 650 cm −1 were assigned to the bending stretching vibration of the Sn−C group in the studied coordination polymers, respectively. For all the samples, the broad absorption peaks in the range of 2844−2997 cm −1 were associated with the symmetric and asymmetric stretching vibrations of C−C and C−H groups, and the other vibration peaks observed at 995−1629 cm −1 were due to the various organic and metal organic functional groups present in the coordinated polymers.…”

“…The organometallic coordination polymers were prepared by using the procedures reported in the literature with some modification, , and the precipitation process was used during the synthesis.…”

One‐pot synthesis of quinazolinones and quinazolines under visible light via decarboxylation of α‐hydroxy acids

“…Therefore, various alternatives to aldehydes, such as alcohols, amines, nitriles, and acids, have been successfully used as the starting materials to provide the corresponding quinazoline and quinazolinone compounds via condensation with 2-aminobenzamide or 2-aminobenzylamine [15][16][17][18][19][20][21][22]. Although these methods are convenient, they also possess some limitations, such as complex operation, rigor react conditions, high temperature, and the use of stoichiometric or excessive oxidants [23][24][25][26]. Therefore, it is very necessary to explore new routes for the simple synthesis of quinazolinones and quinazolines.…”