Novel sugar-based azacrown ethers with phosphinoxidoalkyl side chain (2 a - e) have been synthesized. They show significant asymmetric induction as phase transfer catalysts in the Michael addition of 2-nitropropane to chalcone (95% ee) and to 3-fur-2-yl-1-phenyl-propenone (80% ee).
我们合成了具有膦酰氧基烷基侧链(2 a - e)的新型糖基氮杂环醚。在
2-硝基丙烷与
查尔酮(95% ee)和 3-
呋喃-2-基-1-苯基-
丙烯酮(80% ee)的迈克尔加成反应中,它们作为相转移催化剂显示出明显的不对称诱导作用。