d-Mannitol-derived novel chiral thioureas: Synthesis and application in asymmetric Henry reactions
作者:Miaoxi Liu、Nan Ji、Li Wang、Peng Liu、Wei He
DOI:10.1016/j.tetlet.2018.01.082
日期:2018.3
Five novel thioureas have been obtained through multi-step reactions from d-Mannitol as starting material and applied as catalysts in the asymmetric Henry reaction. Using catalyst 7a, (1S,2R)-2-nitro-1-phenylpropan-1-ol containing two chiral centers was obtained in high yield and with high selectivity (up to 95% yield, 87% ee, 91:9 dr). This catalyst also retained activity in the presence of water
通过以d-甘露糖醇为原料的多步反应已获得了五种新颖的硫脲,并已将其用作不对称亨利反应的催化剂。使用催化剂7a,以高收率和高选择性获得了具有两个手性中心的(1 S,2 R)-2-硝基-1-苯基丙-1-醇(高达95%的收率,87%的ee,91:9博士)。该催化剂在水存在下也保持活性,提供高达93%的收率,88%的ee和94:6 dr。