Sulfonic acid-functionalized ordered nanoporous Na+-montmorillonite (SANM) as an efficient and recyclable catalyst for the tetrahydropyranylation and detetrahydropyranylation of alcohols and phenols

Abstract

Sulfonic acid-functionalized ordered nanoporous Na ? -montmorillonite, as a newly reported solid acid nanocatalyst, was efficiently used for the tetrahydropyranylation and detetrahydropyranylation of alcohols and phenols. All reactions were performed at room temperature in high to excellent yields. Ease of preparation and handling of the catalyst, heterogeneous reaction conditions, easy work-up of the products, high reaction rates and reusability of the catalyst are the main advantages of this method.

Copper(II) Anchored on Amine-Functionalized MMT: A Highly Efficient Catalytic System for the One-Pot Synthesis of Bispyrano[2,3-c]pyrazole Derivatives

“…MMT K10 as an inorganic solid has been used in organic synthesis as a catalyst and catalysis support. In comparison to the bulk supports, MMT K10 nanoclay offers a large number of potential active sites for the reactants as a result of a large surface-area-to-volume ratio, which eventually results in higher yields [23][24][25][26][27][28][29][30][31]. Here, we used MMT K10 as a support to provide a new and highly efficient heterogeneous catalytic system consisting of anchored Cu(OAc) 2 by modified imine (MMT-n-Pr-NH�Py) as a linker for the synthesis of bispyranopyrazole derivatives (Scheme 1).…”