A detailed investigation of the hierarchy of asymmetry operating in the self‐assembly of achiral (1) and chiral ((S)‐2 and (R)‐3) 1,3,5‐triphenylbenzenetricarboxamides (TPBAs) is reported. The aggregation of these TPBAs is conditioned by the point chirality at the peripheral side chains for (S)‐2 and (R)‐3. An efficient helix‐to‐helix interaction that goes further in the organization of fibrillar bundles
Improved synthesis of N-alkyl substituted dithieno[3,2-b:2′,3′-d]pyrroles
作者:Guy Koeckelberghs、Lieven De Cremer、Wouter Vanormelingen、Wim Dehaen、Thierry Verbiest、André Persoons、Celest Samyn
DOI:10.1016/j.tet.2004.10.106
日期:2005.1
A new, convergent and improved synthetic method to prepare N-alkyl substituted dithienopyrroles is described. The procedure consists of a Pd-catalyzed amination of 3,3'-dibromo-2,2'-bithiophene. The reaction conditions were optimized, which makes this method applicable to prepare these molecules easily in high yields and on a large scale. (C) 2004 Elsevier Ltd. All rights reserved.