Novel bifunctional thiourea–ammonium salt catalysts derived from amino acids: application to highly enantio- and diastereoselective aza-Henry reaction
作者:Hong-Yu Wang、Zhuo Chai、Gang Zhao
DOI:10.1016/j.tet.2013.04.079
日期:2013.6
development of new efficient and easily accessible catalysts has been one of the focuses in asymmetric phase-transfer catalysis. In this paper, a novel class of chiral bifunctional thiourea–ammonium phase-transfer catalysts were synthesized from commercially available α-amino acids. The structural modularity of these catalysts permits facile tunings to achieve optimum results, which was demonstrated
新型高效且易于获得的催化剂的开发一直是不对称相转移催化的重点之一。在本文中,从市场上可买到的α-氨基酸合成了一类新型的手性双官能硫脲-铵相转移催化剂。这些催化剂的结构模块性使其易于调节以获得最佳结果,这在催化氮杂-亨利反应中表现出优异的对映选择性(高达99.5%ee)和非对映选择性(高达> 25:1 dr)得到了证明。