Enantioselective Organocatalytic Thiol Addition to α,β-Unsaturated α-Amino Acid Derivatives
作者:Henk Hiemstra、Arjen Breman、Jan Smits、Rene de Gelder、Jan van Maarseveen、Steen Ingemann
DOI:10.1055/s-0032-1317081
日期:——
A new class of Michael acceptors based on α,β-unsaturated amino acids has been prepared and applied in asymmetric organocatalysis. With the use of thiourea derivatives of cinchona alkaloid-derived catalysts, efficient addition of thiols to the dehydroamino acids occurred with formation of β-thiol functionalized α-amino acids in high yields, moderate diastereoselectivities and ee values up to 95%
一类基于α,β-不饱和氨基酸的新型迈克尔受体已被制备并应用于不对称有机催化。使用金鸡纳生物碱衍生催化剂的硫脲衍生物,硫醇有效加成到脱氢氨基酸中,以高产率、中等非对映选择性和高达 95% 的 ee 值形成 β-硫醇官能化的 α-氨基酸。