3- and 4-Uloses Derived from N-Acetyl-D-glucosamine: A Unique Pair of Complementary Organocatalysts for Asymmetric Epoxidation of Alkenes
作者:Christof Schöberl、Volker Jäger
DOI:10.1002/adsc.201100735
日期:2012.3.16
The 4‐ulose and the 3‐ulose, both derived in two steps from the α‐methyl glycoside of N‐acetyl‐D‐glucosamine (GlcNAc), act as organocatalysts in the asymmetric epoxidation of alkenes, with unprecedented complementary enantioselectivity. The best results are found with α,β‐unsaturated esters as substrates, with enantiomeric ratios up to 90:10 and 11:89, respectively.
N-乙酰基-D-葡糖胺(GlcNAc)的α-甲基糖苷(GlcNAc)分两步衍生出来的4-ulose和3-ulose在烯烃的不对称环氧化中起有机催化剂的作用,具有前所未有的互补对映选择性。以α,β-不饱和酯为底物发现最佳结果,对映体比例分别高达90:10和11:89。