New ionic liquid supported tin reagents were synthesized for use in Stille cross coupling reactions at low reaction temperatures and with the possibility for recycling the tin compounds.

Three new depsidones, parmosidones F – G (1 – 2), and 8′-O-methylsalazinic acid (3), and 3 new diphenylethers, parmetherines A – C (4 – 6), together with 2 known congeners were isolated from the whole thalli of Parmotrema dilatatum, a foliose chlorolichen. Their structures were unambiguously determined by extensive spectroscopic analyses and comparison with literature data. The isolated polyphenolics were assayed for their α-glucosidase inhibitory activities. Newly reported benzylated depsidones 1 and 2 in particular inhibited α-glucosidase with IC₅₀ values of 2.2 and 4.3 µM, respectively, and are thus more potent than the positive control, acarbose. ^* These authors contributed equally to this work (co-first authors). ^** These authors contributed equally to this work (co-last authors). Received: 24 February 2020 Accepted after revision: 12 June 2020 Publication Date: 20 August 2020 (online) © 2020. Thieme. All rights reserved. Georg Thieme Verlag KG Stuttgart · New York