ompg-C3N4/SO3H: an efficient and recyclable organocatalyst for the facile synthesis of 2,3-dihydroquinazolin-4(1H)-ones

Preparation and characterization of graphitic carbon nitride-supported l-arginine as a highly efficient and recyclable catalyst for the one-pot synthesis of condensation reactions

“… Entry R Product Time (min) Mp (°C) MP (°C , ref.) Yield 1 H 13a 15 207–210 208–210 21 90 2 4-Cl 13b 15 203–206 203–206 36 96 3 3-NO 2 13c 30 192–193 190–193 21 89 4 4-OH 13d 25 213–215 213–215 36 87 5 2-Cl 13e 15 205–206 206–208 22 95 6 4-Me 13f. 25 200–201 198–201 22 86 7 4-NO 2 13g 20 201–202 200–202 36 90 8 …”

ompg-C3N4/SO3H organocatalyst-mediated green synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3] oxazin-3-ones under solvent-free and mild conditions: a fast and facile one-pot three-component approach

“…Sulfonated ordered mesoporous graphitic carbon nitride (ompg-C 3 N 4 /SO 3 H) was prepared and characterized through the method that we have recently reported (further details Scheme 1 and characterization information are available in the supporting information) [43,44]. Preservation of the original framework of ompg-C 3 N 4 after immobilization of the-SO 3 H groups is indicated in Fig.…”

“…Sulfonated ordered mesoporous graphitic carbon nitride (ompg-C 3 N 4 /SO 3 H) was prepared through the method that we have recently reported [43,44].…”

“…Therefore, the development of a novel synthetic methodology for the synthesis of these compounds under milder conditions is still in great demand. Accordingly, in connection with our previous efforts toward the synthesis of ompg-C 3 N 4 -based heterogeneous organocatalysts [42], we have recently reported the synthesis of pharmaceutically interesting compounds catalyzed by superactive sulfonated highly ordered mesoporous graphitic carbon nitride (ompg-C 3 N 4 /SO 3 H) as an efficient heterogeneous solid acid catalyst [43,44]. Herein, we report the application of ompg-C 3 N 4 /SO 3 H as a more practical and efficient catalyst for the facile and green synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e] [1,3]oxazin-3-one derivatives.…”

5,5’-Indigodisulfonic acid as an efficient catalyst for the synthesis of 2,3-dihydroquinazolinone derivatives

“…Off-white solid, TLC Rf = 0.50 (DCM/MeOH = 10:1), m.p. = 221-223 °C (literature [28] 221-224 °C). 1 H NMR (400 MHz, DMSO) δ 8.79 (s, 1H), 7.64 (s, 1H), 7.55 -7.43 (m, 3H), 7.28 (dd, J = 10.5, 4.8 Hz, 2H), 7.24 -7.11 (m, 2H), 6.77 (d, J = 8.0 Hz, 1H), 6.61 -6.51 (m, 1H), 1.64 (s, 3H).…”