Room temperature ionic liquids have been employed for the first time as novel and recyclable reaction media for the chemoselective conversion of aldehydes into their corresponding 1,3-oxathio- and dithioacetal derivatives in excellent yields under mild and neutral conditions. A wide range of functional and protecting groups such as TBDMS, PMB, THP, MOM, benzyl, propargyl ethers, acetonides, carbamates and esters are survived under these reaction conditions. The recovered activated ionic liquids can be recycled for four to five subsequent runs with consistency in activity.
室温
离子液体首次被用作新型且可回收的反应介质,用于在温和中性条件下将醛选择性转化为相应的1,3-氧
硫杂环和二
硫杂环衍
生物,产率极佳。在这些反应条件下,包括TB
DMS、PMB、THP、MOM、苄基、
炔丙基醚、
乙缩醛、
氨基甲酸酯和酯等多种功能性和保护性官能团都能稳定存在。回收的活性
离子液体可循环用于后续四到五次反应,活性保持一致。