许多天然和药物产品中都存在手性β-内酰胺和环丁酮。手性四元环化合物的立体选择性结构是化学界面临的挑战。本文中,我们报告了通过Ir / In-BiphPHOX催化的不对称加氢对四元环(微型)β-内酰胺和环丁酮进行高度立体控制的结构,从而提供了相应的旋光四元环羰基产物,这些产物带有α-手性碳中心,在温和的反应条件下(1.0-2.5 bar H 2)具有出色的收率(高达99%)和对映选择性(高达98%)持续1.0-10小时)。该反应代表了广泛的底物范围。还进行了催化产物的多种转化,以显示该方案的潜在效用。
许多天然和药物产品中都存在手性β-内酰胺和环丁酮。手性四元环化合物的立体选择性结构是化学界面临的挑战。本文中,我们报告了通过Ir / In-BiphPHOX催化的不对称加氢对四元环(微型)β-内酰胺和环丁酮进行高度立体控制的结构,从而提供了相应的旋光四元环羰基产物,这些产物带有α-手性碳中心,在温和的反应条件下(1.0-2.5 bar H 2)具有出色的收率(高达99%)和对映选择性(高达98%)持续1.0-10小时)。该反应代表了广泛的底物范围。还进行了催化产物的多种转化,以显示该方案的潜在效用。
Base-Dependent Cascade Synthesis of Novel Pyrano[3,2-<i>c</i>]coumarin Derivatives from Baylis–Hillman Bromide
作者:Shao-Qin Ge、Xi Yang、Bin Wu、Min Xia
DOI:10.1080/00397910903029933
日期:2010.3.12
on a base, which goes through SN2-SN2 nucleophilic substitution and intramolecular Michael addition. The product structures are confirmed by x-ray crystallography, and a tentative mechanism of the cascade process is presented.
Catalytic Asymmetric Construction of Spiro(γ-butyrolactam-γ-butyrolactone) Moieties through Sequential Reactions of Cyclic Imino Esters with Morita-Baylis-Hillman Bromides
作者:Huai-Long Teng、He Huang、Chun-Jiang Wang
DOI:10.1002/chem.201201475
日期:2012.10.1
Spiro(γ‐butyrolactam‐γ‐butyrolactone): A route to enantioenriched spiro(γ‐butyrolactam‐γ‐butyrolactone) compounds, a valuable motif for drug discovery, was developed by use of a highly efficient copper(I)/TF‐BiphamPhos‐catalyzed tandem Michael addition–elimination of homoserine lactone derived cycliciminoesters with Morita–Baylis–Hillman (MBH) bromides, followed by treatment with para‐toluenesulfonic