Wu P, Wang L, Wu K, Yu Z. Copper(I)-Catalyzed Nitrosylation/Annulation Cascade of Enaminones with
tert-Butyl Nitrite: Access to 1
H-1,2,3-Triazole 2-Oxides.
Org Lett 2023;
25:8434-8438. [PMID:
37971421 DOI:
10.1021/acs.orglett.3c03302]
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Abstract
The direct synthesis of triazole 2-oxides has posed a challenge in the field of N-heterocyclic chemistry. A novel copper(I)-catalyzed nitrosylation/annulation cascade of enaminones provides a straightforward route to 1H-1,2,3-triazole 2-oxides by forming new C-N, N=N, and N-N bonds using noncorrosive tert-butyl nitrite (TBN) as both the N and NO sources. The synthetic protocol features easily accessible starting materials, wide substrate scopes, and good tolerance toward various functional groups while avoiding use of explosive azides.
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