A chiral calcium complex was found to be effective for the Mannich reactions of malonates with N-Boc imines. The desired adducts were obtained in excellent yields (up to 95%) with moderate to good enantioselectivities (up to 77% ee).
Highly Enantioselective Synthesis of N-Protected β-Amino Malonates Catalyzed by Magnetically Separable Heterogeneous Rosin-Derived Amino Thiourea Catalysts: A Stereocontrolled Approach to β-Amino Acids
作者:Hao Zhu、Xianxing Jiang、Xinghua Li、Chen Hou、Yu Jiang、Ke Hou、Rui Wang、Yanfeng Li
DOI:10.1002/cctc.201300089
日期:2013.8
A rosin by any other name: Magnetic‐nanoparticle‐supported bifunctional rosin‐derived tertiary aminothioureacatalysts are developed for the stereocontrolledsynthesis of chiral β‐aminoacids. Boc=tert‐butoxycarbonyl, Bn=benzyl.