B(C6F5)3-Catalyzed C–H Alkylation of N-Alkylamines Using Silicon Enolates without External Oxidant
摘要:
An efficient method for the coupling of N-alkylamines with silicon enolates to generate beta-amino carbonyl compounds is disclosed. These reactions proceed by activation of alpha-amino C-H bonds by B(C6F5)(3), which likely generates a "frustrated" acid/base complex in the presence of large N-alkylamines. The transformation requires no external oxidant and releases hydrosilane as a byproduct. The utility of this method is demonstrated in the late-stage functionalization of bioactive molecules such as citalopram, atomoxetine, and fluoxetine.
Selective Monomethylation of Amines with Methanol as the C
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Source
作者:Geunho Choi、Soon Hyeok Hong
DOI:10.1002/anie.201801524
日期:2018.5.22
methanol as the methylating agent, which is a sustainable chemical feedstock. Kinetic control of the aliphatic amine monomethylation was achieved by using a readily available rutheniumcatalyst at an adequate temperature under hydrogen pressure. Various substrates including bio‐related molecules and pharmaceuticals were selectively monomethylated, demonstrating the general utility of the developed method