Ugi 5-center-4-component reaction of α-amino aldehydes and its application in synthesis of 2-oxopiperazines
Marta Splandesci,
Martyna Z. Wróbel,
Izabela D. Madura
et al.
Abstract:A synthetic route leading to densely functionalized 2-oxopiperazines is presented. The strategy employs a 5-center-4-component variant of Ugi multicomponent reaction followed by a deprotection/cyclization sequence. N-Boc-α-amino aldehydes were used for the first time as carbonyl components in a key Ugi 5-center-4-component reaction (U-5C-4CR). It is shown that the presented synthetic route can lead to rigid, heterocyclic scaffolds, as demonstrated by the synthesis of tetrahydro-2H-pyrazino[1,2-a]pyrazine-3,6,9… Show more
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