About the Synthesis of Heterocyclic Analogues of Marginalin and Their Transformation Products
摘要:
Pyridine-2 or 4-carboxaldehyde, furan-2-aldehyde, were condensed on 2-coumaranone and on 5-hydroxy 2-coumaranone to give new ene-lactones analogues of the natural marginalin. Only the addition compounds issued from 2-coumaranone could give stilbene methyl esters and no rearrangement into benzo [b] furan carboxylates could be observed. These observations are discussed in relation with previous results in the series.
Chiral phosphine-catalyzed tunable cycloaddition reactions of allenoates with benzofuranone-derived olefins for a highly regio-, diastereo- and enantioselective synthesis of spiro-benzofuranones
作者:De Wang、Guo-Peng Wang、Yao-Liang Sun、Shou-Fei Zhu、Yin Wei、Qi-Lin Zhou、Min Shi
DOI:10.1039/c5sc03135d
日期:——
The first regioselective catalytic asymmetric [3 + 2] cycloaddition of benzofuranone-derived olefins with allenoates and substituted allenoates has been developed in the presence of (R)-SITCP.
A Highly Efficient Chirality Switchable Synthesis of Dihydropyran-Fused Benzofurans by Fine-Tuning the Phenolic Proton of β-Isocupreidine (β-ICD) Catalyst with Methyl
A highlyenantioselective β‐isocupreidine (β‐ICD) catalyzed synthesis of dihydropyran‐fused benzofurans through [4+2] cycloaddition of allenoates and benzofuranone alkenes was developed. Switchable chirality inversion of cycloaddition products was achieved by replacing the phenolic proton of the catalyst with a methyl, demonstrating an amazing effect of minimal structural variation on inverting enantioselectivity