Development of Bifunctional Thiourea Organocatalysts Derived from a Chloramphenicol Base Scaffold and their Use in the Enantioselective Alcoholysis of<i>meso</i>Cyclic Anhydrides
作者:Lin-Jie Yan、Hai-Feng Wang、Wen-Xue Chen、Yuan Tao、Kai-Jun Jin、Fen-Er Chen
DOI:10.1002/cctc.201600228
日期:2016.7.6
chloramphenicol‐base‐derived thiourea organocatalysts, (1S,2R)‐12 a–f and (1R,2R)‐15 a–c, and their use in the enantioselective alcoholysis of meso‐anhydrides are described. In particular, hemiesters afforded excellent enantioselectivities if low loadings of (1S,2R)‐12 a–f were used. Almost no enantioselectivities were achieved with the use of (1R,2R)‐15 a–c. This technique was used to synthesize (R)‐(−)‐baclofen
新的氯霉素基硫脲有机催化剂(1 S,2 R)-12 a - f和(1 R,2 R)15 a - c的合成及其在介孔酸酐的对映选择性醇解中的应用描述。特别是,如果使用低负荷的(1 S,2 R)-12 a – f负载,半酯具有出色的对映选择性。使用(1 R,2 R)‐ 15 a – c几乎没有达到对映选择性。该技术用于合成(R)-(-)-baclofen。