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How to access efficiently the macrocyclic structure remained to be a challenging synthetic topic. Although many elegant approaches/reactions have been developed, construction of diverse collection of macrocycles is still elusive. This chapter summarized the recently emerged research area dealing with multicomponent synthesis of macrocycles, with particular emphasis on the approach named “multiple...
Abweichendes Verhalten: Entgegen ihrer normalen Reaktivität gingen Isocyanide in Gegenwart von ZnBr2 eine Trimerisierung mit Carbonsäuren unter Bildung von Oxazolen ein (siehe Schema). Die Reaktion beginnt mit einer nucleophilen Addition der Carbonsäure an ein ligiertes Isocyanidmolekül, an die sich eine Sequenz aus doppelter migratorischer Insertion, Metallsalz‐Eliminierung, Acylmigration, Cyclisierung...
The reaction of aldehydes and ketones, including aliphatic and aromatic ones, with amides of α-isocyano-β-phenylpropionic acid in toluene in the presence of lithium bromide gives 2,4,5-trisubstituted oxazoles in good to excellent yield. Protected chiral α-amino aldehydes participate in this reaction to give, after hydrolysis of the oxazoles, norstatine-containing peptides in good overall yield. The...
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