Metathesis access to monocyclic iminocyclitol-based therapeutic agents

• Ileana Dragutan,
• Valerian Dragutan,
• Carmen Mitan,
• Hermanus C.M. Vosloo,
• Lionel Delaude and
• Albert Demonceau

Beilstein J. Org. Chem. 2011, 7, 699–716, doi:10.3762/bjoc.7.81

• , nojirimycin (NJ, trivial name for 5-amino-5-deoxy-D-glucopyranose) (59), the first alkaloid discovered that mimicks a sugar (originally isolated from Streptomyces filtrate but also found in other bacterial cultures and plant sources), is a potent glycosidase inhibitor. In aqueous solution nojirimycin exists

Application of the diastereoselective photodeconjugation of α,β-unsaturated esters to the synthesis of gymnastatin H

• Ludovic Raffier and
• Olivier Piva

Beilstein J. Org. Chem. 2011, 7, 151–155, doi:10.3762/bjoc.7.21

• manumycin C (12) isolated from Streptomyces parvulus [13]. Different groups have investigated the synthesis of gymnastatins 10a–c [14][15][16], compounds 11 [17] and 12 [18]. In most cases, the lateral acid chain was prepared starting from (R)-2-methyloctanal by iterative Wittig reactions to build the

Stereoselective synthesis of four possible isomers of streptopyrrolidine

• Debendra K. Mohapatra,
• Barla Thirupathi,
• Pragna P. Das and
• Jhillu S. Yadav

Beilstein J. Org. Chem. 2011, 7, 34–39, doi:10.3762/bjoc.7.6

• Streptomyces sp. found in deep sea sediments [12]. The system is present in many biologically active compounds [13][14][15][16][17][18][19][20][21] and it could act as a versatile intermediate for the synthesis of a wide range of γ-amino acids as well as pyrrolidines [22][23]. The interesting chemical

One-pot three-component synthesis of quinoxaline and phenazine ring systems using Fischer carbene complexes

• Priyabrata Roy and
• Binay Krishna Ghorai

Beilstein J. Org. Chem. 2010, 6, No. 52, doi:10.3762/bjoc.6.52

• heterocycles which exhibit a wide range of biological activities. Many phenazine compounds are found in nature and are produced by bacteria such as Pseudomonas spp., Streptomyces spp. and Pantoea agglomerans. These phenazine natural products have been implicated in the virulence and competitive fitness of the

Synthesis of phosphonate and phostone analogues of ribose-1-phosphates

• Pitak Nasomjai,
• David O'Hagan and
• Alexandra M. Z. Slawin

Beilstein J. Org. Chem. 2009, 5, No. 37, doi:10.3762/bjoc.5.37

• bacterium Streptomyces cattleya as part of its defense strategy since 4-fluorothreonine (2) has antibiotic activity and fluoroacetate (1) is a toxin [1]. The biosynthetic pathway from fluoride ion to these fluorometabolites has largely been elucidated and is summarised in Scheme 1 [2]. The first committed

Mitomycins syntheses: a recent update

• Jean-Christophe Andrez

Beilstein J. Org. Chem. 2009, 5, No. 33, doi:10.3762/bjoc.5.33

• . Discussion 1. Mitomycin isolation and nomenclature Mitomycins are natural products isolated from extracts of genus Streptomyces, a filamentous gram-positive soil bacterium that produces a wide array of biologically active compounds, including over two-thirds of the commercially important natural-product

• metabolites [21]. Mitomycin C is extracted from the bacterium Streptomyces lavendulae and is far from the most known compound of the series. It has become one of the most effective drugs against non-small-cell lung carcinoma, as well as other soft and solid tumours [22]. The seven most abundant mitomycins (A

Phaeochromycins F–H, three new polyketide metabolites from Streptomyces sp. DSS-18

• Jian Li,
• Chun-Hua Lu,
• Bao-Bing Zhao,
• Zhong-Hui Zheng and
• Yue-Mao Shen

Beilstein J. Org. Chem. 2008, 4, No. 46, doi:10.3762/bjoc.4.46

• ), H (3), were obtained from the culture broth of marine actinomycete strain Streptomyces sp. DSS-18. Their structures were established on the basis of detailed spectroscopic analyses, including 1D-, 2D-NMR and HR-ESI MS techniques. Keywords: biological properties; isolation; polyketides; Streptomyces

• from marine derived actinomycetes, a strain of the genus Streptomyces was isolated from deep sediment collected from the west Pacific. Herein, we report the isolation and structure determination and biological properties of three new polyketides, namely phaeochromycins F (1), G (2) and H (3), from

• Streptomyces sp. DSS-18 (see Figure 1). Results and Discussion Fermentation was carried out at 28 °C for 2 weeks with aeration (10 L/min) under constant agitation (240 rpm). After filtration of the harvested culture broth, the culture filtrate was extracted exhaustively with ethyl acetate. The ethyl acetate

Diels- Alder reactions using 4,7-dioxygenated indanones as dienophiles for regioselective construction of oxygenated 2,3-dihydrobenz[f]indenone skeleton

• Natsuno Etomi,
• Takuya Kumamoto,
• Waka Nakanishi and
• Tsutomu Ishikawa

Beilstein J. Org. Chem. 2008, 4, No. 15, doi:10.3762/bjoc.4.15

• acid-induced ring opening to give 2,3-dihydrobenz[f]indenone with undesired 4,5,9-trioxy functions. Background Kinamycins, isolated from Streptomyces murayamaensis sp. nov. Hata et Ohtani in 1970 [1][2][3], have attracted attention due to their antibiotic and antitumor activities [7][8][9][10]. These