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Investigations of Quaternary Pyridinium Salts, XVII. Cyclopeptide-like Substances from Salts of the Amides of Nicotinoylamino Acids
Guendel, Wolf-H.
, p. 305 - 312 (2007/10/02)
The amides of niconinoylamino acids were prepared and alkylated to the quaternary salts 1f-n.The α-amino acid moiety in 1 is S configurated.The salt 1 cyclise under the influence of base to give the cyclopeptide-like substances 4,5 and 7, with seven- or fourteen (sixteen, eighteen-) membered rings, respectively. - Key words: Pyridinium Salts, Insertion Reaction, Cyclopeptides
