An expedient route to substituted furans via olefin cross-metathesis
作者:Timothy J. Donohoe、John F. Bower
DOI:10.1073/pnas.0913466107
日期:2010.2.23
of highly substituted derivatives are essential to medicinal chemistry. Here we show that the olefin CM reaction, in combination with an acid cocatalyst or subsequent Heck arylation, provides a concise and flexible entry to 2,5-di- or 2,3,5-tri-substituted furans. These cascade processes portend further opportunities for the regiocontrolled preparation of other highly substituted aromatic and heteroaromatic
烯烃交叉复分解 (CM) 反应广泛用于有机化学,是选择性合成差异取代烯烃产物的有效方法。令人惊讶的是,尚未报道将这一非凡的过程整合到芳香族和杂芳香族构建策略中的努力。这种结构代表了大多数小分子药物化合物的关键要素;高度取代衍生物的受控制备方法对于药物化学是必不可少的。在这里,我们展示了烯烃 CM 反应与酸助催化剂或随后的 Heck 芳基化相结合,为 2,5-二-或 2,3,5-三-取代呋喃提供了简洁而灵活的入口。
Diastereoselective construction of anti-4,5-disubstituted-1,3-dioxolanes via a bismuth-mediated two-component hemiacetal oxa-conjugate addition of γ-hydroxy-α,β-unsaturated ketones with paraformaldehyde
作者:Aleksandr Grisin、Samuel Oliver、Michael D. Ganton、John Bacsa、P. Andrew Evans
DOI:10.1039/c5cc01949d
日期:——
The bismuth-mediated two-component hemiacetal oxa-conjugate addition provides a mild method for the stereoselective construction of anti-4,5-disubstituted 1,3-dioxolanes.
Photochemical Alkene Isomerization for the Synthesis of Polysubstituted Furans and Pyrroles under Neutral Conditions
作者:Johannes C. L. Walker、Simon Werrel、Timothy J. Donohoe
DOI:10.1002/chem.201903590
日期:2019.10.11
A photochemical approach to polysubstituted heterocycles using UV-induced alkene isomerization is described. The method allows for the synthesis of disubstituted furans and pyrroles under mild and neutral conditions and also provides access to a class of trisubstituted furans pertinent to natural-product synthesis. The method has broad functional-group tolerance and many richly decorated heterocycles