Cover Feature: Linear Coumarinacenes Beyond Benzo[g]coumarins: Synthesis and Promising Characteristics (Eur. J. Org. Chem. 45/2020)

Abstract

The Cover Feature shows a representation of a 21st century molecular unition (the act of joining of hands) of the 19th century molecular couple (structures in blue) with a purpose of rediscovering a new life together (structure in red). More information can be found in the Communication by S. Dutta, P. Venkatakrishnan et al.

Rhodium-catalysed additive-free alkoxycarbonylation of indoles: 2,4,6-trimethylbenzoic acid-based carbonate anhydrides as a versatile alkoxycarboxyl source

“…The investigation on carboxylating reagents has garnered considerable attention in the past decade for their environmentally benign CO-free process, resulting in various reagents, such as azodicarboxylates, [21][22][23][24][25][26][27][28] chloroformates, [29][30][31] oxaziri-dines, 32 glyoxylates, 33 α-keto esters, 34 dicarbonates, [35][36][37][38] formates, 39 potassium oxalates, 40 carbazates, [41][42][43] bromodifluoroacetates 44 and tetrabromomethanes [45][46][47][48] (Scheme 1B). However, these reactions necessitate the use of stoichiometric amounts of additives, such as oxidants and bases, and alkoxycarbonylations without any stoichiometric additives have rarely been reported.…”