Preparation of cyclic urethanes from amino alcohols and carbon dioxide using ionic liquid catalysts with alkali metal promoters

作者：Fujita Shin ichiro^*; Kanamaru Hiroshi; Senboku Hisanori; Arai Masahiko

来源：International Journal of Molecular Sciences, 2006, 7(10): 438-450.

DOI：10.3390/i7100438

• cyclic urethane
• amino alcohol
• carbon dioxide
• ionic liquid catalyst
• alkali promoter

Several ionic liquids were applied as catalysts for the synthesis of cyclic urethanes from amino alcohols and pressurized CO2 in the presence of alkali metal compounds as promoters. A comparative study was made for the catalytic performance using different ionic liquids, substrates, promoters, and pressures. The optimum catalytic system was BMIM-Br promoted by K2CO3, which, for 1-amino-2-propanol, produced cyclic urethane in 40% yield with a smaller yield of substituted cyclic urea and no oligomeric byproducts. For other amino alcohols, cyclic urethanes, cyclic ureas, and/or undesired byproducts were produced in different yields depending on the substrates used. Possible reaction mechanisms are proposed.

• 出版日期2006-10