An ‘impossible’ macrocyclisation using conformation directing protecting groups
摘要:
A p-benzenetricarboxamide macrocycle linked through secondary cis amides is obtained via cyclisation and subsequent deprotection of a folded linear precursor. Secondary benzamides strongly prefer the trans conformation, therefore this synthesis can be considered 'impossible' without recourse to protecting groups. (C) 2009 Elsevier Ltd. All rights reserved.
An ‘impossible’ macrocyclisation using conformation directing protecting groups
摘要:
A p-benzenetricarboxamide macrocycle linked through secondary cis amides is obtained via cyclisation and subsequent deprotection of a folded linear precursor. Secondary benzamides strongly prefer the trans conformation, therefore this synthesis can be considered 'impossible' without recourse to protecting groups. (C) 2009 Elsevier Ltd. All rights reserved.