N-Methylation of adamantane-substituted oxalamide unit affects its conformational rigidity: A skew conformation of the oxalamide bridge
摘要:
The synthesis of adamantane functionalized retropeptides, N,N'-bis(2-adamantyl-2-carboxylic acid methyl ester)oxalamide (1) and Nmethyl-N,N'-bis(2-adamantyl-2-carboxylic acid methyl ester)oxalamide (2), as well as the influence of the N-methylation on the conformational preferences of oxalamide group are described. In the solid state the oxalamide group of I is planar while in the retropeptide 2 adopts a skew-conformation. (c) 2007 Elsevier B.V. All rights reserved.