Direct and Asymmetric Nickel(II)-Catalyzed Construction of Carbon–Carbon Bonds from <i>N</i>-Acyl Thiazinanethiones
作者:Stuart C. D. Kennington、Adam J. Taylor、Pedro Romea、Fèlix Urpí、Gabriel Aullón、Mercè Font-Bardia、Laura Ferré、Jesus Rodrigalvarez
DOI:10.1021/acs.orglett.8b03757
日期:2019.1.4
direct and enantioselective carbon–carbon-bond-forming reactions catalyzed by nickel(II) complexes. The electrophilic species are mostly prepared in situ from ortho esters, methylethers, acetals, and ketals, which makes the overall process highly efficient and experimentally straightforward. Theoretical calculations indicate that the reactions proceed through an open transition state in a SN1-like
在镍(II)配合物催化下,许多直接的和对映选择性的碳-碳键形成反应中使用了各种各样的新的N-酰基噻嗪硫酮。亲电子物质大多是从原酸酯,甲基醚,乙缩醛和缩酮原位制备的,这使得整个过程非常高效且实验简单。理论计算表明,反应以类似S N 1的机制通过开放的过渡态进行。这种新方法的实用性已通过合成有用中间体的不对称制备和胡椒粉D的全合成得到了证明。
Direct and Enantioselective Aldol Reactions Catalyzed by Chiral Nickel(II) Complexes
作者:Stuart C. D. Kennington、Saul F. Teloxa、Miguel Mellado‐Hidalgo、Oriol Galeote、Sabrina Puddu、Marina Bellido、Pedro Romea、Fèlix Urpí、Gabriel Aullón、Mercè Font‐Bardia
DOI:10.1002/anie.202104352
日期:2021.7.5
A direct and asymmetric aldol reaction of N-acyl thiazinanethiones with aromatic aldehydes catalyzed by chiral nickel(II) complexes is reported. The reaction gives the corresponding O-TIPS-protected anti-aldol adducts in high yields and with remarkable stereocontrol and atom economy. Furthermore, the straightforward removal of the achiral scaffold provides enantiomerically pure intermediates of synthetic
报道了由手性镍 (II) 配合物催化的N-酰基噻嗪烷硫酮与芳香醛的直接和不对称醛醇反应。该反应以高产率和显着的立体控制和原子经济性得到相应的O -TIPS 保护的抗醛醇加合物。此外,非手性支架的直接去除提供了合成感兴趣的对映异构纯中间体,其中涉及抗-α-氨基-β-羟基和α,β-二羟基羧酸衍生物的前体。理论计算解释了观察到的高立体控制。
Direct, Stereodivergent, and Catalytic Michael Additions of Thioimides to α,β‐Unsaturated Aldehydes – Total Synthesis of Tapentadol
作者:Oriol Galeote、Stuart C. D. Kennington、Gabriela Benedito、Lena Fraedrich、Evan Davies‐Howe、Anna M. Costa、Pedro Romea、Fèlix Urpí、Gabriel Aullón、Mercè Font‐Bardia、Cristina Puigjaner
DOI:10.1002/anie.202319308
日期:2024.3.18
regioselective and stereodivergent Michael additions of thioimides to α,β-unsaturated aldehydes catalyzed by chiral nickel complexes give any of the potential syn and anti diastereomers, at will, with good to high yields. The resultant adducts can be easily transformed into a wide array of enantiomericallypure intermediates ready to participate in the asymmetricsynthesis of biologically active compounds.