Synthesis of a new complex of lanthanum on MCM-41 as an efficient and reusable heterogeneous catalyst for the chemoselective synthesis of sulfoxides and tetrahydrobenzo[b]pyrans

Abstract

In this project, L-arginine salen Schiff-base complex of lanthanum on the functionalized surface of mesoporous MCM-41 (La@L-ASS@MCM-41) was synthesized. At first step, 3-iodopropyl trimethoxysilane (IPTMS) was synthesized from 3-chloropropyl trimethoxysilane and potassium iodide via simple S N 2 substitution reaction in dry acetone solvent. Then, the surface of hexagonal channels of mesoporous MCM-41 was modified with IPTMS groups

3-(Sulfamic acid)-propyltriethoxysilane on biochar nanoparticles as a practical, biocompatible, recyclable and chemoselective nanocatalyst in organic reactions

“…Based on the literature, 51 a catalytic mechanism for the synthesis of tetrahydrobenzo[ b ]pyrans in the presence of SAPES@BNPs is shown in Scheme 6. At first, the carbonyl aldehyde group activated by SAPES@BNPs catalyst condenses with malononitrile through Knoevenagel-type condensation, which produces intermediate I .…”

“…Tetrahydrobenzo[b] pyrans are interesting organic compounds, which have many applications, such as antianaphylactic, antifungal, anticancer, antibacterial, anticoagulant, antioxidant, antiviral, antileishmanial, spasmolytic, and antiallergenic. [48][49][50][51] 2. Experimental…”

Homoselective synthesis of tetrazole derivatives using copper complex anchored on mesoporous KIT‐6 as a reusable, highly efficient, and environmentally green nanocatalyst

“…1,[40][41][42] Therefore, porous materials emerged as catalyst supports. 43 For these reasons, several mesoporous silica was introduced, i.e., MCM-48, MCM-41, SBA-16, SBA-1, SBA-15, and KIT-6. Among them, KIT-6 mesoporous shows a threedimensional symmetric cubic structure Ia3d of channels.…”

“…Cobalt, copper, neodymium, nickel, palladium, samarium, cadmium, lanthanum, and manganese are among the metals used for this purpose. 5,43,[52][53][54][55][56] Tetrazoles have a wide range of applications in material chemistry, medicinal chemistry, coordination chemistry, biochemistry, explosives, agriculture, rocket propellants, and photographic agents. They are also used in the syntheses of various drug intermediates and are representative of active pharmacophores for several therapeutic active molecules such as antibiotic, antiallergic, antiviral, antiinflammatory, antineoplastic, antihypertensive, anti-HIV, antidiabetic, photographic industry, agriculture, explosives, cytostatic, nootropic, hypotensive, and receptor modulator activities.…”

Copper (II)‐azo sulfathiazole complex immobilized on UiO‐66‐NH2 (MOF) as a catalyst for the one‐pot synthesis of spiroindole‐pyranopyrazoles

“…They result in lower costs, lower waste, and reduced pollution by reducing complexity and substrate variety. In addition, they reduce the number of atoms, pots, and steps 33–48 …”