A facile and metal‐free access to pyrazoles from 1,3‐diarylpropenes and hydrazines via multiple inter‐/intramolecular C‐H aminations was described. Under the neutral and mild 2,3‐dichloro‐5,6‐dicyanobenzoquinone (DDQ) oxidative conditions, various disubstituted pyrazoles were synthesized in moderate to excellent yields. This method provides a pot‐ and step‐economic strategy for the construction of
Copper-Catalyzed Aza-Benzyl Transfer Michael Addition via C–C Bond Cleavage
作者:Si-Qi Xiong、Chuan-Ming Hong、Qing-Hua Li、Tang-Lin Liu
DOI:10.1021/acs.joc.2c02740
日期:2023.3.17
A non-noble Cu-catalyzed transfer aza-benzyl Michael addition via the C–Cbondcleavage of aza-benzyl alcohols has been disclosed. The unstrained C(sp3)–C(sp3) bond of an alcohol was selectively cleaved. This aza-benzyl transfer strategy provides a selective and environmentally benign approach for the C-alkylation of α,β-unsaturated carbonyl compounds that employs readily available alcohols as carbon