PhI(OAc)<sub>2</sub>-mediated one-pot oxidative decarboxylation and aromatization of tetrahydro-β-carbolines: synthesis of norharmane, harmane, eudistomin U and eudistomin I
A new strategy for synthesis of β-carbolines via one-pot oxidative decarboxylation at room temperature is developed for the first time.
首次开发了一种在室温下通过一锅法氧化脱羧合成β-咔啉的新策略。
Efficient and Practical One-Pot Conversions of N-Tosyltetrahydroisoquinolines into Isoquinolines and of N-Tosyltetrahydro-β-carbolines into β-Carbolines through Tandem β-Elimination and Aromatization
An efficient, practical, and general method for conversions of N-tosyltetrahydroisoquinolines (N-tosyl-THIQs) into isoquinolines and of N-tosyltetrahydro-β-carbolines (N-tosyl-THBCs) into β-carbolines is described. Treatment of N-tosyl-THIQs or N-tosyl-THBCs with base in dimethyl sulfoxide afforded dihydroisoquinolines or dihydro-β-carbolines as intermediates, and these were then oxidized in situ by
Diastereospecific Synthesis of Tetrahydroisoquinolines via Radical Cyclization: Application in the Synthesis of ent‐Tadalafil
作者:Wei‐Jung Chiu、Yan‐Liang Lin、Indrajeet J. Barve、Chung‐Ming Sun
DOI:10.1002/adsc.202100506
日期:2021.8.13
An enantioselectivesynthesis of 1-substituted tetrahydroisoquinolines from L–Dopa methylester through intramolecular aryl radical cyclization is demonstrated. The strategy consists of bromination of (S)-2-amino-3-(2-bromo-4,5-dimethoxyphenyl)propanoate followed by condensation with various aldehydes to afford bromoimidate ester. Aryl radicals generated from bromoimidate ester under the radical generating
证明了通过分子内芳基环化从 L-多巴甲酯中对映选择性合成 1-取代的四氢异喹啉。该策略包括(S)-2-氨基-3-(2-溴-4,5-二甲氧基苯基)丙酸酯的溴化,然后与各种醛缩合得到溴亚胺酸酯。在自由基生成条件 ( n Bu 3 SnH/AIBN)下由溴亚胺酯生成的芳基通过6-内模式环化,以 99% ee 独家提供顺式-1-取代的四氢异喹啉。该合成方案的效用在 (6 S , 12a S) 他达拉非(5 步,21%,99% ee)。
Iodine catalyzed oxidative C(CO)–C(methyl) bond cleavage in methyl ketones: Application to the synthesis of β-Carboline-3-esters
作者:Satyanarayana Battula、Narsaiah Battini、Jigar Y. Soni、Keyur M. Pandya
DOI:10.1016/j.tetlet.2023.154872
日期:2024.1
A novel synthesis of substituted β-carboline-3-esters was achieved by the molecular iodine catalyzed reaction of tryptophan methyl ester hydrochlorides with methyl ketones through oxidative C(CO) − C(methyl) bondcleavage. The products in these reactions are similar to those produced in regular Pictet-Spengler reactions of tryptophan methyl esters with analogous aldehyde substrates. Studies revealed
Simple and efficient method for aromatization of tetrahydro-β-carbolines by using K2S2O8 as a catalyst and its antimicrobial activity comparison with molecular docking studies
A novel and efficient aromatization of tetrahydro-beta-carbolines under mild conditions using K2S2O8 as a catalyst was developed. The method is applicable for all kinds of C-1 substituted systems. All synthesized compounds were screened for their in vitro antibacterial activity against Staphylococus aureus, Bacillus subtilis, Escherichia coli, and Klebsiella pneumonia, as well as fungi, such as Aspergillus flavus and Fusarium oxysporum. Compounds 4b, 4g, 4i, and 4k demonstrated excellent in vitro antibacterial and antifungal activities than the standard drugs. The docking studies were carried out for most active compounds 4b, 4g, 4i, and 4k.