Modern flow chemistry – prospect and advantage

• Philipp Heretsch

Beilstein J. Org. Chem. 2023, 19, 33–35, doi:10.3762/bjoc.19.3

• into one another [11]. This concept has been adapted and further refined by Gilmore and co-workers, introducing automated multistep synthesizers [12], as well as Heretsch et al. in a setup optimized for natural products synthesis and late-stage manipulations [13]. To address customized reactor

Functionalization of imidazole N-oxide: a recent discovery in organic transformations

• Koustav Singha,
• Imran Habib and
• Mossaraf Hossain

Beilstein J. Org. Chem. 2022, 18, 1575–1588, doi:10.3762/bjoc.18.168

• histidine and the related local-immune hormone histamine. In the structural view of DNA and RNA, purine bases contain imidazole moieties. Also, imidazole N-oxides have various and intriguing applications in natural products synthesis, catalysis, and coordination chemistry [3]. Derivatives of imidazole

Synthesis of highly substituted fluorenones via metal-free TBHP-promoted oxidative cyclization of 2-(aminomethyl)biphenyls. Application to the total synthesis of nobilone

• Ilya A. P. Jourjine,
• Lukas Zeisel,
• Jürgen Krauß and
• Franz Bracher

Beilstein J. Org. Chem. 2021, 17, 2668–2679, doi:10.3762/bjoc.17.181

• existing literature [38] and further investigations may thus give way to new synthetic possibilities in natural products synthesis in cases access to or cyclization of benzylamine moieties appears practical. Moreover, aldehyde precursors may not only be less readily available than nitrile precursors but

Synthesis and biological evaluation of 1,2-disubstituted 4-quinolone analogues of Pseudonocardia sp. natural products

• Stephen M. Geddis,
• Teodora Coroama,
• Suzanne Forrest,
• James T. Hodgkinson,
• Martin Welch and
• David R. Spring

Beilstein J. Org. Chem. 2018, 14, 2680–2688, doi:10.3762/bjoc.14.245

Synthesis of a leopolic acid-inspired tetramic acid with antimicrobial activity against multidrug-resistant bacteria

• Luce Mattio,
• Loana Musso,
• Leonardo Scaglioni,
• Andrea Pinto,
• Piera Anna Martino and
• Sabrina Dallavalle

Beilstein J. Org. Chem. 2018, 14, 2482–2487, doi:10.3762/bjoc.14.224

• class of antibacterial agents active also against resistant strains. Keywords: antimicrobial activity; multidrug-resistant bacteria; natural products; synthesis; tetramic acid; Introduction The treatment of bacterial infections by antibiotics is widely regarded as one of the major achievements of the

Synthesis of spirocyclic scaffolds using hypervalent iodine reagents

• Fateh V. Singh,
• Priyanka B. Kole,
• Saeesh R. Mangaonkar and
• Samata E. Shetgaonkar

Beilstein J. Org. Chem. 2018, 14, 1778–1805, doi:10.3762/bjoc.14.152

• . The reaction products 39 were isolated in good yields with more than 78% enantiomeric excess (Scheme 10). The active catalytic hypervalent iodine species was generated in situ by oxidation of optically active iodoarene 38 using mCPBA as an oxidant. 2.4. Application of spirolactones in natural products

• synthesis In 2005, Wipf and Spencer [79] reported the first total synthesis of the Stemona alkaloid (−)-tuberostemonine (40). In this report, PIDA (15) was used as an electrophile for the synthesis of spirolactone 16 in 35% yield by the cyclization of L-tyrosine 14 in nitromethane at room temperature for

Synthesis of 1-indanones with a broad range of biological activity

• Marika Turek,
• Dorota Szczęsna,
• Marek Koprowski and
• Piotr Bałczewski

Beilstein J. Org. Chem. 2017, 13, 451–494, doi:10.3762/bjoc.13.48

• medicine, agriculture and in natural products synthesis [1][2][3]. In addition, structurally related indanes also showed biological activity and have been reviewed by Ahmed in 2016 [4]. Extensive studies on bioactivity of 1-indanone derivatives open up more and more new possibilities of their applications

Natural products in synthesis and biosynthesis II

• Jeroen S. Dickschat

Beilstein J. Org. Chem. 2016, 12, 413–414, doi:10.3762/bjoc.12.44

• Jeroen S. Dickschat Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany 10.3762/bjoc.12.44 Keywords: biosynthesis; natural products; synthesis; As a continuation of the first two Thematic Series in

Study on the synthesis of the cyclopenta[f]indole core of raputindole A

• Nils Marsch,
• Mario Kock and
• Thomas Lindel

Beilstein J. Org. Chem. 2016, 12, 334–342, doi:10.3762/bjoc.12.36

• which provided the hydrogenated tricyclic cyclopenta[f]indole core system in high yield. Keywords: gold-catalyzed reactions; heterocycles; indole alkaloids; natural products; synthesis; Introduction The raputindoles (1, raputindole A, Figure 1) from the rutaceous tree Raputia simulans Kallunki

Amino acid motifs in natural products: synthesis of O-acylated derivatives of (2S,3S)-3-hydroxyleucine

• Oliver Ries,
• Martin Büschleb,
• Markus Granitzka,
• Dietmar Stalke and
• Christian Ducho

Beilstein J. Org. Chem. 2014, 10, 1135–1142, doi:10.3762/bjoc.10.113

Acid- mediated reactions under microfluidic conditions: A new strategy for practical synthesis of biofunctional natural products

• Katsunori Tanaka and
• Koichi Fukase

Beilstein J. Org. Chem. 2009, 5, No. 40, doi:10.3762/bjoc.5.40

• prominent biological activity in a “practical” and a “industrial” manner. Keywords: acid-mediated reaction; microreactor; natural products synthesis; oligosaccharide; pristane; Introduction A continuous flow microreactor, an innovative technology, has been used to realize efficient mixing and fast heat

Convenient method for preparing benzyl ethers and esters using 2-benzyloxypyridine

• Susana S. Lopez and
• Gregory B. Dudley

Beilstein J. Org. Chem. 2008, 4, No. 44, doi:10.3762/bjoc.4.44

• suitable for the synthesis of halobenzyl ethers [25], which are emerging from their niche in natural products synthesis [26] because of their growing importance in carbohydrate chemistry [27][28][29][30][31]. The experiment outlined in Scheme 4 suggests that the observations described in this article for

Synthesis of 2,6-trans- disubstituted 5,6-dihydropyrans from (Z)-1,5-syn-endiols

• Eric M. Flamme and
• William R. Roush

Beilstein J. Org. Chem. 2005, 1, No. 7, doi:10.1186/1860-5397-1-7

• -disubstituted 5,6-dihydropyrans. Application of this methodology in natural products synthesis will be reported in due course. Cyclodehydration of diol 2a Cyclodehydration of other diol substrates Cyclization of Hydroxymesylates 11 Supporting Information Supporting Information File 3: Experimental details