A Brønsted Acid Catalyzed Cascade Reaction for the Conversion of Indoles to α‐(3‐Indolyl) Ketones by Using 2‐Benzyloxy Aldehydes
作者:Ankush Banerjee、Modhu Sudan Maji
DOI:10.1002/chem.201902268
日期:2019.9.2
A Brønstedacid catalyzed, operationally simple, scalable route to several functionalized α-(3-indolyl) ketones has been developed and the long-standing regioisomeric issue has been eliminated by choosing appropriate carbonyls. A readily available and cheap bottle reagent was used as the catalyst. This protocol was also applicable to the synthesis of densely functionalized α-(3-pyrrolyl) ketones. A
Total Syntheses of Demethylasterriquinone B1, an Orally Active Insulin Mimetic, and Demethylasterriquinone A1
作者:Michael C. Pirrung、Zhitao Li、Kaapjoo Park、Jin Zhu
DOI:10.1021/jo020182a
日期:2002.11.1
monoaddition using the sterically hindered 2-isoprenylindole. This permits addition of the second indole, 7-prenylindole, which gives both meta- and para-substituted bis-indolylquinone products. This regiochemical control problem was solved by extension of a method we recently developed for acid-promotedaddition of indoles to 2,5-dichlorobenzoquinone. Under our original mineral acid conditions, reaction
Methyl Scanning: Total Synthesis of Demethylasterriquinone B1 and Derivatives for Identification of Sites of Interaction with and Isolation of Its Receptor(s)
作者:Michael C. Pirrung、Yufa Liu、Liu Deng、Diana K. Halstead、Zhitao Li、John F. May、Michael Wedel、Darrell A. Austin、Nicholas J. G. Webster
DOI:10.1021/ja044325h
日期:2005.4.1
activity against even unknown targets, and thus provides an excellent complement to structural biology. Methyl scanning was applied to demethylasterriquinone B1, a small-molecule mimetic of insulin. A new, optimal totalsynthesis of this natural product was developed that enables the family of methyl scan derivatives to be concisely prepared for evaluation in a cellular assay. The results of this experiment
Synthesis of 2,5-Dihydroxy-3-(indol-3-yl)benzoquinones by Acid-Catalyzed Condensation of Indoles with 2,5-Dichlorobenzoquinone
作者:Michael C. Pirrung、Liu Deng、Zhitao Li、Kaapjoo Park
DOI:10.1021/jo0204597
日期:2002.11.1
conjugate addition of indoles to 2,5-dichlorobenzoquinone have been developed. A wide variety of indoles substituted with halogen, alkyl, alkoxy, and aryl groups participate in anaerobic condensation reactions promoted by HCl, H2SO4, or CH3CO2H. The hydroquinone product is partially oxidized by excess dichlorobenzoquinone and fully converted to the 2,5-dichloro-3-(indol-3-yl)benzoquinone targets by
Synthesis of Racemic, N-Benzylated Neoechinulin A and Isoneoechinulin A¹
作者:Branko Stanovnik、Jernej Wagger、Uroš Grošelj、Jurij Svete
DOI:10.1055/s-0029-1219812
日期:2010.5
Two N-benzylated analogues of the antioxidant, radical scavenging, and neuroprotective alkaloid neoechinulin A were prepared. Since, according to SAR studies, stereochemistry does not play an important role, both analogues were prepared in racemic form, using enaminone chemistry.
本研究制备了两种具有抗氧化、清除自由基和神经保护作用的生物碱新噌啉 A 的 N-苄基类似物。由于根据 SAR 研究,立体化学并不发挥重要作用,因此这两种类似物都是通过烯酮化学以外消旋形式制备的。