Environmentally benign, one-pot synthesis of pyrans by domino Knoevenagel/6π-electrocyclization in water and application to natural products
作者:Ene Jin Jung、Byung Ho Park、Yong Rok Lee
DOI:10.1039/c0gc00265h
日期:——
In water medium, environmentally benign, facile, and efficient synthesis of pyrans was achieved in good yields by the reactions of a variety of cyclic 1,3-dicarbonyls with several α,β-unsaturated aldehydes. The key strategy was a formal [3+3] cycloaddition by domino Knoevenagel/6Ï- electrocyclization. This methodology was applied to the synthesis of biologically interesting pyranocoumarin, pyranoquinolinone, and pyranonaphthoquinone derivatives along with selected natural and non-natural products.
One-Pot Preparation of Pyranoquinolinones by Ytterbium(III) Trifluoromethanesulfonate-Catalyzed Reactions: Efficient Synthesis of Flindersine, N-Methylflindersine, and Zanthosimuline Natural Products
作者:Yong Rok Lee、Hyuk Il Kweon、Wha Soo Koh、Kyung Rak Min、Youngsoo Kim、Seung Ho Lee
DOI:10.1055/s-2001-17516
日期:——
An efficient synthesis of pyranoquinolinones is achieved by ytterbium(III) triflate-catalyzed reaction of 4-hydroxy-2-quinolones with a variety of α,β-unsaturated aldehydes in moderate yields. This new method has been applied to the synthesis of pyranoquinolinone alkaloids.
Efficient Synthesis of Substituted Pyranoquinolinones from 2,4-Dihydroxyquinoline: Total Synthesis of Zanthosimuline, <b><i>cis</i></b>-3<b>′</b>,4<b>′</b>-Dihydroxy-3<b>′</b>,4<b>′</b>-dihydroflindersine, and Orixalone D
作者:Yong Lee、Xue Wang
DOI:10.1055/s-2007-983893
日期:2007.10
A convenient and efficient synthesis of pyranoquinoli-nones was achieved using the ethylenediamine diacetate catalyzed reactions of 2,4-dihydroxyquinoline and a variety of α,β-unsaturated aldehydes in good yield. The key feature of these reactions is the formal [3+3] cycloaddition. This new methodology was applied successfully to the total synthesis of naturally occurring pyranoquinolinone alkaloids
使用乙二胺二乙酸酯催化的 2,4-二羟基喹啉和多种 α,β-不饱和醛的反应以良好的收率实现了一种方便高效的吡喃喹啉酮合成。这些反应的关键特征是正式的 [3+3] 环加成。这种新方法成功地应用于天然存在的吡喃喹啉酮生物碱、zanthosimuline、CIS-3',4'-dihydroxy-3',4'-dihydroflindersine 和 orixalone D 的全合成。
Pericyclic Cascade toward Isochromenes: Application to the Synthesis of Alkaloid Benzosimuline
作者:Martín J. Riveira、Agustina La-Venia、Mirta P. Mischne
DOI:10.1021/acs.joc.6b01278
日期:2016.9.2
The synthesis of biologically active alkaloid benzosimuline, isolated from the shrub Zanthoxylum simulans, is reported. Key transformation involves an oxa-6π electrocyclic ring-opening/hetero-Diels–Alder pericycliccascade. Although the last aromatization step proved to be cumbersome, this work unfolds a unique route to access interesting molecules from simple precursors
Studies on Biomimetic Singlet Oxygen Oxidations: Application to the Synthesis of the Alkaloid Simulenoline
作者:Martín J. Riveira
DOI:10.1021/acs.jnatprod.0c00210
日期:2020.4.24
The synthesis of the biologically active alkaloid simulenoline, isolated from the roots of Zanthoxylum simulans, is reported. The natural product was assembled from simple commercial reagents via initial domino Knoevenagel/oxa-6π-electrocyclization followed by a one-pot singlet-oxygen ene-reaction/reduction sequence. New insights of singlet oxygen reactivity with olefinic substrates have been revealed