Chiral Vanadyl(V) Complexes Enable Efficient Asymmetric Reduction of β-Ketoamides: Application toward (<i>S</i>)-Duloxetine
作者:Chien-Tien Chen、Nabin Ch. Maity、Rachit Agarwal、Chien-Fu Lai、Yiya Liao、Wei-Ru Yu
DOI:10.1021/acs.joc.0c00221
日期:2020.5.15
High-valent chiral oxidovanadium(V) complexes derived from 3,5-substituted-N-salicylidene-l-tert-leucine were used as catalysts in asymmetric reduction of N-benzyl-β-ketoamides. Among six different solvents, three different alcohol additives, and two different boranes examined, the use of pinacolborane in tetrahydrofuran (THF) with a t-BuOH additive led to the best results at -20 °C. The corresponding
衍生自3,5-取代的-N-水杨基-1-叔-亮氨酸的高价手性氧化钒(V)络合物被用作不对称还原N-苄基-β-酮酰胺的催化剂。在六种不同的溶剂,三种不同的醇添加剂和两种不同的硼烷中,使用频哪醇硼烷与四氢呋喃(t-BuOH)添加剂在四氢呋喃(THF)中使用在-20°C时可获得最佳结果。相应的β-羟酰胺的产率最高为92%,对映体过量(ee)最高为99%。我们已经成功地扩展了该催化方案,以合成(S)-度洛西汀前体。