Palladium‐Catalyzed Regioselective and Diastereoselective
<i>C</i>
‐Glycosylation by Allyl‐Allyl Coupling
作者:Junhao Li、Nan Zheng、Xuelun Duan、Rui Li、Wangze Song
DOI:10.1002/adsc.202001136
日期:2021.2.2
A Pd‐catalyzed C‐glycosylation reaction was developed by allyl‐allyl coupling process using Achmatowicz rearrangement products as donors and methylcoumarins as acceptors under mild conditions. This method featured regio‐ and diastereoselectivities, stereodivergent synthesis of C‐glycosides. The glycosyl donors with controlled stereodiversity and glycosyl acceptors with fluorescent performace further
Enantio- and Diastereoselective Synthesis of Substituted Tetrahydro-1<i>H</i>-isochromanes through a Dynamic Kinetic Resolution Proceeding under Dienamine Catalysis
作者:Ane Orue、Efraím Reyes、Jose L. Vicario、Luisa Carrillo、Uxue Uria
DOI:10.1021/ol301602h
日期:2012.7.20
nes react with enolizable α,β-unsaturatedaldehydes in the presence of a chiral secondary amine catalyst furnishing a wide range of differently substituted tetrahydro-1H-isochromanes with excellent results. The reaction relies on the activation of the enal by the catalyst through the formation of a dienamine intermediate, which undergoes a Diels–Alder/elimination cascade reaction. Moreover, the overall
C-Aryl Glycosylation: Palladium-Catalyzed Aryl–Allyl Coupling of Achmatowicz Rearrangement Products with Arylboronic Acids
作者:Ming Wai Liaw、Wai Fung Cheng、Rongbiao Tong
DOI:10.1021/acs.joc.0c00688
日期:2020.5.15
The first Pd-catalyzed arylation of Achmatowiczrearrangement products with arylboronic acids under mild conditions (rt) to provide the synthetically versatile C-aryl dihydropyranones is reported. It is found that the 4-keto group of Achmatowicz products is essential to increase the reactivity of the Pd-π-allyl complex toward arylboronic acids and that phosphine as the palladium ligand would be destructive
Asymmetric Total Synthesis of the Iridoid β-Glucoside (+)-Geniposide via Phosphine Organocatalysis
作者:Regan A. Jones、Michael J. Krische
DOI:10.1021/ol900360h
日期:2009.4.16
Phosphine-catalyzed [3 + 2] cycloaddition of ethyl-2,3-butadienoate with enone (S)-3b occurs with high levels of regio- and stereocontrol to deliver the cis-fused cyclopenta[c]pyran 4 characteristic of the iridoid family of natural products. Cycloadduct 4 was converted to the iridoid glycoside (+)-geniposide in 10 steps.