46 research outputs found
New Applications of Solid Silica Chloride (SiO 2 -Cl) in Organic Synthesis. Efficient Preparation of Diacetals of 2,2-Bis(Hydroxymethyl)-1,3-propanediol from Different Substrates and Their Transthioacetalization Reactions. Efficient Regeneration of Carbonyl Compounds from Acetals and Acylals
No full textA New Approach to the Reduction of Sulfoxides to Sulfides with 1,3-Dithiane in the Presence of Electrophilic Bromine as Catalyst
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A STUDY OF OXIDATIVE DEPROTECTION OF TRIMETHYLSILYL (TMS) AND TERT-BUTYLDIMEHYLSILYL (TBDMS) ETHERS OF ALCOHOLS WITH POTASSIUM PERMANGANATE (KMnO 4
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TiCl<sub>2</sub>(OTf)-SiO<sub>2</sub>: A solid stable lewis acid catalyst for Michael addition of α-Aminophosphonates, Amines, Indoles and Pyrrole
No full text<p>TiCl<sub>2</sub>(OTf)-SiO<sub>2</sub> is simply prepared by immobilization of TiCl<sub>3</sub>(OTf) on silica gel surface and introduced as a non-hygroscopic Lewis acid catalyst for C-N and C-C bond formation <i>via</i> Michael addition reaction. A variety of structurally diverse nitrogen nucleophiles including α-aminophosphonates, aliphatic and aromatic amines and imidazole were evaluated as Michael donors. Friedel–Crafts alkylation of indoles and pyrrole was also investigated through Michael addition reaction in the presence of TiCl<sub>2</sub>(OTf)-SiO<sub>2</sub> as a catalyst. The reactions were conducted at room temperature or 60 °C under solvent-free conditions and the desired Michael adducts were obtained in high to excellent yields.</p> <p></p
