A protocol for the copper-catalyzed oxidative self-coupling of α-amino carbonylcompounds has been developed for the synthesis of tetrasubstituted 1,4-enediones (Z-isomers) in moderate to good yields through the cleavage of four sp3C–H bonds and the simultaneous formation of one C=C double bond in the α-amino carbonylcompound. The strategy has the advantages of using readily available starting materials
NH<sub>4</sub>PF<sub>6</sub>-promoted cyclodehydration of α-amino carbonyl compounds: efficient synthesis of pyrrolo[3,2,1-ij]quinoline and indole derivatives
NH4PF6 is an inexpensive, safe, and low-toxicity inorganic salt; it was found to promote the cyclodehydration of α-amino carbonyl compounds in the absence of metal reagents. This simple cyclodehydration strategy enables highly atom-economic formation of pyrrolo[3,2,1-ij]quinoline and indole derivatives, which are significant pharmacophores.
NH 4 PF 6是一种廉价,安全且低毒的无机盐;发现在不存在金属试剂的情况下可促进α-氨基羰基化合物的环脱水。这种简单的环脱水策略使吡咯并[3,2,1- ij ]喹啉和吲哚衍生物具有很高的原子经济性,这是重要的药效团。
TEMPO-Promoted Mono- and Bisimidation of Tertiary Anilines: Synthesis of Symmetric and Unsymmetric <i>N</i>-Mannich Bases
作者:Xiu Juan Xu、Adila Amuti、Wen Jing Hu、Qiaerbati Adelibieke、Abudureheman Wusiman
DOI:10.1021/acs.joc.2c00700
日期:2022.7.15
A TEMPO-promoted method was developed for the synthesis of symmetric bis-N-Mannich bases via sequential activation of two α,α′-amino C(sp3)–H bonds of N,N-dimethylanilines under mild conditions. This methodology was further extended for monoimidation of α-amino-functionalized methylanilines to give unsymmetric N-Mannich bases in good to high yields. Several control experiments were performed, and the