Format:
Online-Ressource
ISSN:
1099-0690
Content:
Abstract: The acid‐catalyzed three‐component (3 C) UGI reaction of isocyanides, amines, and aldehydes generally gives α‐amino amidines. Herein, we report the graphene oxide (GO)‐promoted promoted 3 C Ugi reaction followed by a C−N bond oxidation to provide rapid access to α‐imino amidines. GO plays a crucial role both in the multicomponent reaction and in the subsequent oxidation. Interestingly, α‐imino amidines bearing electron‐donating groups undergo spontaneous cyclization leading substituted 2,3‐diamino indolenines. The scope of the process has been investigated with respect to all three components, and a comparison between the one‐pot and sequential approaches is given. The major advantages of the developed methodology include one‐pot synthesis, operational simplicity, high atom economy, broad substrate scope, multicomponent character, and applicability towards gram scale synthesis. Recovery and regeneration of GO and investigation of its real active sites has been performed by control experiments and X‐ray photoelectron spectroscopy (XPS).
In:
day:15
In:
month:02
In:
year:2024
In:
extent:12
In:
European journal of organic chemistry, Weinheim : Wiley-VCH Verl., 1998-, (15.02.2024) (gesamt 12), 1099-0690
Language:
English
DOI:
10.1002/ejoc.202400070
URN:
urn:nbn:de:101:1-2024021614030656683533
URL:
https://doi.org/10.1002/ejoc.202400070
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2024021614030656683533
URL:
https://d-nb.info/1319600867/34
URL:
https://doi.org/10.1002/ejoc.202400070
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