Magnesium Hydrogensulfate [Mg(HSO4)2] as an Efficient Catalyst for the Preparation of Silyl Ethers, Dibenzo[a,j]xanthenes, and Octahydroxanthene Derivatives
摘要:
Magnesium hydrogensulfate [Mg(HSO4)(2)], as a heterogeneous solid acid catalyst, has been used for the mild formation of trimethylsilyl (TMS) ethers from various primary, secondary, and tertiary aliphatic alcohols; aromatic alcohols; and oximes using hexamethyldisilazane (HMDS) under ambient conditions. In addition, 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo- octahydroxanthene derivatives were synthesized in the presence of Mg(HSO4)(2) with short reaction times in high to excellent yield under solvent-free conditions.
One-pot preparation of β-amido ketones/esters in a three-component condensation reaction using magnesium hydrogensulfate as an effective and reusable catalyst
three-component condensation of an aryl aldehyde, an enolizable ketone or β-keto ester, acetyl chloride, and acetonitrile or benzonitrile in the presence of magnesium hydrogensulfate as an active, recoverable, and reusable green catalyst is described for the synthesis of β-amido ketones/esters at room temperature. The key features of this methodology are simplicity, mild reaction conditions, and high