Enantioselective Synthesis of
<i>cis</i>
‐Decalin Derivatives by the Inverse‐Electron‐Demand Diels–Alder Reaction of 2‐Pyrones
作者:Xu‐Ge Si、Zhi‐Mao Zhang、Cheng‐Gong Zheng、Zhan‐Ting Li、Quan Cai
DOI:10.1002/anie.202006841
日期:2020.10.12
A novel strategy for the synthesis of cis‐decalins by an ytterbium‐catalyzed asymmetric inverse‐electron‐demand Diels–Alderreaction of 2‐pyrones and silyl cyclohexadienol ethers is reported here. A broad range of synthetically important cis‐decalin derivatives with multiple contiguous stereogenic centers and functionalities are obtained in good yields and stereoselectivities. A full set of diastereomeric
An enantioselective ambimodal cross-Diels–Alder reaction and applications in synthesis
作者:Meng-Meng Xu、Limin Yang、Kui Tan、Xiangyang Chen、Qi-Tao Lu、K. N. Houk、Quan Cai
DOI:10.1038/s41929-021-00687-x
日期:——
d adducts with high enantioselectivity under mild reaction conditions. Computational studies showed that this reaction proceeds through an ambimodal transition state: post-transition-state bifurcation leads to [2+4] and [4+2] adducts with the same enantioselectivity, followed by a facile Cope rearrangement to provide a single observed thermodynamic [2+4] product. This reaction occurs with a wide variety
An Enantioselective Approach to
<scp>Heteroatom‐Containing</scp>
Bicyclic Derivatives via
<scp>Inverse‐Electron‐Demand</scp>
Diels−Alder Reactions
作者:Jun‐Xiong He、Xu‐Ge Si、Qi‐Tao Lu、Qian‐Wei Zhang、Quan Cai
DOI:10.1002/cjoc.202200441
日期:2023.1
important pharmacophores and prevalent in bioactive natural products and drug molecules. Herein, we report a unified approach for the divergent synthesis of chiral heteroatom-containing bicyclic derivatives by lanthanide (III)-catalyzed asymmetric inverse-electron-demand Diels–Alder reactions of 2-pyrones. These reactions occur with various readily available dihydropyrroles and dihydrofurans as dienophiles
With electronically unbiased styrenes and indenes as dienophiles, a highly enantioselective all-carbon-based inverse-electron-demand Diels–Alder reaction of electron-deficient 2-pyrones is reported. Using C1-symmetric imidazolidine-pyrroloimidazolone pyridine as the tridentate ligand and Ni(OTf)2 as the Lewis acid, diverse bridged bicyclic lactones were obtained in high yields (88–97% yields), diastereoselectivities