Total synthesis of dl-asparenomycins was accomplished with direct conversion of carbonates 13a, 13b and l&, 14b to asparenomycin esters 15 and 16 and carboxy deprotectionby the A1C13-anisole method. --Asparenomycin A A, a broad spectrum antibiotic with potent B-lactamase inhibitory activity, which
Structures of OA-6129A, B1, B2 and C, new carbapenem antibiotics
β Scribed by Takeo Yoshioka; Ikuo Kojima; Kunio Isshiki; Azuma Watanabe; Yasutaka Shimauchi; Mitsuyasu Okabe; Yasuo Fukagawa; Tomoyuki Ishikura
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- French
- Weight
- 220 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The structures of carbapenems OA-6129A, B,, B2 and C were determlned by spectroscopy and chemical transformation In the course of our extensive work on carbapenems, B2($) and C($,)') new compounds OA-6129A(l), Bl($), have been isolated as sodium salts from Streptmyces sp. OA-6129 These compounds showed potent antlmlcroblal activity against Gram-posltlve and -negative bacteria2 and inhibitory activity to &lactamases In this communication, we report the structure determination of the antibiotics by means of spectroscopic analysis, chemical degradation
π SIMILAR VOLUMES
Krivoruchko. -Chem. Abst. 1\_1. 50409 (1969). 9) The C-H long range couplings observed between C-4a (681.6) and 6-H (66.89) and between C-3 (675.3) and 3-CH3 (61.24) indicates that the remaining quaternary oxycarbon (680.2) is assignable to C-12b.
Novel substituted 1,8\_diazaanthraquinone structures of diazaquinomycins A and B were determined by the application of nmr spectroscopy. Diazaquinomycins A') (1) and B (z), produced by Streptomyces sp. OM-704, exhibit antibacterial activities against Gram-positive bacteria and are antimetabolites of