Organocatalysis in Conjugate Amine Additions. Synthesis of β-Amino Acid Derivatives
作者:Mukund P. Sibi、Kennosuke Itoh
DOI:10.1021/ja071739c
日期:2007.7.1
Conjugate addition of O-protected hydroxylamines to pyrazole-derived enoates proceeds with high efficiency and enantioselectivity when chiral thioureas are used as activators. A wide variety of substrates undergo conjugate amine addition providing access to enantioenriched β-amino acid derivatives. Structural requirements for the optimal thiourea catalyst have been established, and the results suggest
当手性硫脲用作活化剂时,O-保护的羟胺与吡唑衍生的烯酸酯的共轭加成以高效率和对映选择性进行。多种底物经历共轭胺加成,提供对映体富集的 β-氨基酸衍生物的途径。已经确定了最佳硫脲催化剂的结构要求,结果表明它可以作为双功能催化剂运行。