Improved procedure for the synthesis of 6-alkoxy-2,3-dihydro-6h-pyran-3-ones (2,3-dideoxy-dl-pent-2-enopyranos-4-uloses). Neat conversion into polyfunctionalized cyclopentenones
Discovery of Inhibitors of the Wnt and Hedgehog Signaling Pathways through the Catalytic Enantioselective Synthesis of an Iridoid-Inspired Compound Collection
作者:Hiroshi Takayama、Zhi-Jun Jia、Lea Kremer、Jonathan O. Bauer、Carsten Strohmann、Slava Ziegler、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201306948
日期:2013.11.18
iridoid‐inspired compound collection was synthesized efficiently by the resolution of cyclic enones in an asymmetric cycloaddition with azomethine ylides. The collection contained novel potent inhibitors of the Wnt and Hedgehogsignaling pathways.
作者:Yang Liu、Zhongyi Mao、Alexandre Pradal、Pei-Qiang Huang、Julie Oble、Giovanni Poli
DOI:10.1021/acs.orglett.8b01616
日期:2018.7.6
The synthesis of bi- and tricyclic structures incorporating pyrrolidone rings is disclosed, starting from resonance-stabilized acetamides and cyclic α,β-unsaturated-γ-oxycarbonyl derivatives. This process involves an intermolecular Tsuji–Trost allylation/intramolecular nitrogen 1,4-addition sequence. Crucial for the success of this bis-nucleophile/bis-electrophile [3 + 2] annulation is its well-defined
Synthesis of benzofurans via an acid catalysed transacetalisation/Fries-type O → C rearrangement/Michael addition/ring-opening aromatisation cascade of β-pyrones
作者:Siddheshwar K. Bankar、Jopaul Mathew、S. S. V. Ramasastry
DOI:10.1039/c6cc01016d
日期:——
An unusual and facile approach for the synthesis of 2-benzofuranyl-3-hydroxyacetones from 6-acetoxy-[small beta]-pyrones and phenols is presented.
提出了一种由6-乙酰氧基-β-吡喃酮和苯酚合成2-苯并呋喃基-3-羟基丙酮的不寻常且简便的方法。
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
Diastereoselective Conjugate Radical Additions to β-Pyranones
作者:Mukund Sibi、Arvin Yu
DOI:10.1055/s-2007-992381
日期:——
We have developed a convenient protocol for functionalization of β-pyranones. Conjugate radical addition and tandem addition-trapping protocols allow for accessing highly substituted pyrones in a single operation with high selectivity.