A Convergent One-Pot Synthesis of Secondary Amines via Aza-Wittig Reaction
摘要:
Secondary amines are obtained in moderate-good yields by reduction of crude imines prepared from N-alkyltriethoxyiminophosphoranes and aldehydes via the aza-Wittig reaction. N-Alkyltriethoxyiminophosphoranes are synthesized by one-pot azidation of alkyl bromides followed by Staudinger reaction.
A Convergent One-Pot Synthesis of Secondary Amines via Aza-Wittig Reaction
摘要:
Secondary amines are obtained in moderate-good yields by reduction of crude imines prepared from N-alkyltriethoxyiminophosphoranes and aldehydes via the aza-Wittig reaction. N-Alkyltriethoxyiminophosphoranes are synthesized by one-pot azidation of alkyl bromides followed by Staudinger reaction.
Imines are selectively formed by coupling of nitriles and amines under mild hydrogen pressure. The reaction is catalyzed by a bipyridine-based PNN Ru(II) pincer complex and proceeds under mild, neutral conditions at 4 bar of H(2).
亚胺是通过在适度的氢气压力下将腈和胺偶联而选择性形成的。该反应由基于联吡啶的PNN Ru(II)夹杂物催化,并在4 bar H(2)的温和中性条件下进行。
Colloidal and Nanosized Catalysts in Organic Synthesis: XXIII. Reductive Amination of Carbonyl Compounds Catalyzed by Nickel Nanoparticles in a Plug-Flow Reactor
作者:V. M. Mokhov、Yu. V. Popov、A. N. Paputina、D. N. Nebykov、E. V. Shishkin
DOI:10.1134/s1070363219120016
日期:2019.12
Reductive amination of aldehydes and ketones with primary and secondary amines under catalysis with nickel nanoparticles supported on zeolite X, MgO, or activated carbon in the gas phase or in the gas-liquid system in a plug-flow reactor proceeds at atmospheric pressure of hydrogen with the formation of secondary or tertiary amines in high yield.