Calix[6]arene-based Brønsted acids for molecular recognition and catalysis

Abstract

A threading process and catalysis governed by trifluoromethylsulfonamide moieties are reported.

Diametric calix[6]arene-based phosphine gold(I) cavitands

“…In this context, we recently devised a new family of triphosphine calix [6]arene gold(I) complexes (Figure 1c) [30]. These cavitands are able to form (pseudo)rotaxane species, by threading viologen-based guests, with a conformational control operated by the sulfonamido hydrogen-bonding donor domain [31,32]. Furthermore, their catalytic activity was demonstrated in promoting gold(I)catalyzed cycloisomerization of 1,6-enynes, with ample scope and high regioselectivity.…”

Experimental and computational studies on the Cinchona anchored calixarene catalysed asymmetric Michael addition reaction

“…Chiral supramolecular organocatalysts anchored with a Brønsted base with the hydrogen-bond donor unit are powerful for asymmetric C–C bond formation. 1 Related Cinchona and its thio(urea)/squaramide derivative catalysed Michael addition of carbanions to β-nitrostyrenes has seen resurgence of activity. 2 Impressive advances in vinylogous Michael addition and tandem cyclization have also been made via Cinchona -mediated catalysts.…”