Highly Regio- and Enantioselective Catalytic Hydrogenation of Enamides in Conjugated Diene Systems: Synthesis and Application of γ,δ-Unsaturated Amino Acids
作者:Mark J. Burk、John G. Allen、William F. Kiesman
DOI:10.1021/ja9731074
日期:1998.2.1
efficient method has been found for the catalytic asymmetric hydrogenation of conjugated α,γ-dienamide esters using the Et-DuPHOS-Rh catalyst system. α,γ-Dienamide ester substrates were prepared via the Suzuki cross-coupling reaction and the Horner−Emmons olefination. Full conversion to the corresponding γ,δ-unsaturated amino acids with very high regio- and enantioselectivity was achieved after short reaction
已发现使用 Et-DuPHOS-Rh 催化剂体系催化共轭 α,γ-二烯酰胺酯不对称氢化的极其有效的方法。α,γ-二烯酰胺酯底物通过铃木交叉偶联反应和霍纳-埃蒙斯烯化反应制备。在很短的反应时间后,以非常高的区域选择性和对映选择性完全转化为相应的 γ,δ-不饱和氨基酸。这种新方法被应用于从前手性二烯酰胺酯合成天然产物bulgecinine。