metal–catalyzed asymmetric allylicsubstitution reactions are well known for installing stereocenters adjacent to branched or E-linear olefins. However, analogous reactions for the synthesis of optically active Z-olefin products are rare. Here we report iridium-catalyzed asymmetric allylicsubstitution reactions that retain Z-olefin geometries while establishing an adjacent quaternary stereocenter. The formation
Copper-Catalyzed Intermolecular Asymmetric Propargylic Dearomatization of Indoles
作者:Wen Shao、He Li、Chuan Liu、Chen-Jiang Liu、Shu-Li You
DOI:10.1002/anie.201503042
日期:2015.6.22
The first copper‐catalyzed intermolecular dearomatization of indoles by an asymmetric propargylic substitution reaction was developed. This method provides a highly efficient synthesis of versatile furoindoline and pyrroloindoline derivatives containing a quaternary carbon stereogenic center and a terminal alkyne moiety with up to 86 % yield and 98 % ee.
Controllable Synthesis of Polyheterocyclic Spirooxindoles and 3,3‐Bistryptophol Oxindoles via Fe(ClO
<sub>4</sub>
)
<sub>3</sub>
⋅ 6H
<sub>2</sub>
O‐Promoted Hetero‐Pictet‐Spengler Reaction
作者:Jun‐Rong Song、Zhi‐Yao Li、Guang‐Di Wang、Ni Zhang、Chao Chen、Juan Chen、Hai Ren、Weidong Pan
DOI:10.1002/adsc.201901346
日期:2020.2.6
hetero‐Pictet‐Spengler reaction has been developed, enabling divergent approaches to plenty of structurally diverse polyheterocyclic spirooxindoles and 3,3‐bistryptophol oxindoles from readily available isatins and substituted aromatic heterocyclic derivatives in up to 98% yield. Mechanistic investigation reveals that the perchloric acid generated upon on hydrolysis of Fe(ClO4)3 ⋅ 6H2O by residual water was the real
Scope of the Reactions of Indolyl- and Pyrrolyl-Tethered <i>N</i>-Sulfonyl-1,2,3-triazoles: Rhodium(II)-Catalyzed Synthesis of Indole- and Pyrrole-Fused Polycyclic Compounds
作者:Liangbing Fu、Huw M. L. Davies
DOI:10.1021/acs.orglett.7b00180
日期:2017.4.7
An efficient synthesis of tetrahydrocarboline-type products and polycyclic spiroindolines has been achieved. The transformation proceeds via rhodium(II)-catalyzed intramolecular annulations of indolyl- and pyrrolyl-tethered N-sulfonyl-1,2,3-triazoles. The reaction could be tuned toward either the formal [3 + 2] cycloaddition or the C–H functionalization reaction depending on the electronic and structural