通过己烷-1,6-二基二氨基甲酸酯连接基将聚乙二醇取代的1-甲基咪唑溴化铵固定在磁性Fe 3 O 4纳米颗粒的表面上,提供了有力且可重复使用的异相转移催化,该催化转移反应已成功用于环氧化物的区域选择性开环水性介质中的叠氮化物和亚硝酸根阴离子。通过简单的磁倾析法可以很容易地回收新催化剂,并循环使用几次,而不会明显丧失催化活性。
the best of our knowledge, KRED-mediated reduction of class II α-nitro ketones (1-aryloxy-3-nitro-2-propanone (4)) is unprecedented. Select β-nitro alcohols, including the synthetic intermediates of bioactive molecules (R)-tembamide, (S)-tembamide, (S)-moprolol, (S)-toliprolol and (S)-propanolol, were stereoselectively synthesized in preparative scale with 42% to 90% isolated yields, showcasing the
Synthesis and characterization of a novel nano-Fe3O4-copoly[(styrene/acrylic acid)/grafted ethylene oxide and its application as a magnetic and recyclable phase-transfer catalyst in the preparation of β-azido alcohols and β-nitro alcohols
A facile method was developed for the synthesis of β-azido alcohols and β-nitro alcohols in the presence of a novel nano-Fe3O4-copoly[(styrene/acrylic acid)/grafted ethylene oxide (nano-Fe3O4-PS-Co-[PAA-g-PEG]) as a phase-transfer catalyst in water. The catalyst was characterized with IR, SEM, and TGA. This procedure offers several advantages, including excellent regioselectivity, high yields, short reaction times, a recyclable catalyst, easy separation of the catalyst through an external magnet, and easy workup .
Synthesis and characterization of a novel nanomagnetic phase-transfer catalyst and its application to regioselective synthesis of β-azido and β-nitro alcohols in water
作者:N. Ayashi、M. Fallah-Mehrjardi、A. R. Kiasat
DOI:10.1134/s1070428017060069
日期:2017.6
Fe3O4 nanoparticles through hexane-1,6-diyldicarbamate linker afforded a powerful and reusable heterogeneous phase-transfer catalysis which was successfully used for regioselectiveringopening of epoxides with azide and nitrite anions in aqueous medium. The new catalyst can readily be recovered by simple magnetic decantation and recycled several times without appreciable loss of catalytic activity
通过己烷-1,6-二基二氨基甲酸酯连接基将聚乙二醇取代的1-甲基咪唑溴化铵固定在磁性Fe 3 O 4纳米颗粒的表面上,提供了有力且可重复使用的异相转移催化,该催化转移反应已成功用于环氧化物的区域选择性开环水性介质中的叠氮化物和亚硝酸根阴离子。通过简单的磁倾析法可以很容易地回收新催化剂,并循环使用几次,而不会明显丧失催化活性。