Formation of Methyl Tetrahydroanhydro-epi-meroobacunolate from Limonin
نویسندگان
چکیده
منابع مشابه
Total Synthesis of Limonin.
Limonoids are highly oxygenated C13α-triterpenes and common secondary metabolites. Several hundred congeners have been isolated to date. The first total synthesis of (±)-limonin, the flagship congener of the limonoids, is now reported and features 1) a tandem radical cyclization generating the BCD ring system with the C13α configuration that is essential to the limonoids and a Robinson annulati...
متن کاملApplications of Epi-Retractable and Co-Epi-Retractable Modules
A module M is called epi-retractable if every submodule of M is a homomorphic image of M. Dually, a module M is called co-epi-retractable if it contains a copy of each of its factor modules. In special case, a ring R is called co-pli (resp. co-pri) if RR (resp. RR) is co-epi-retractable. It is proved that if R is a left principal right duo ring, then every left ideal of R is an epi-retractable ...
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Methyl mercaptan production by oral bacteria is thought to be one of the main causes of oral malodor. We examined the ability of periodontopathic Porphyromonas gingivalis to produce methyl mercaptan from L-methionine and found that the invasive strains W83 and W50 produced large amounts of methyl mercaptan. We cloned and sequenced the mgl gene encoding L-methionine-alpha-deamino-gamma-mercaptom...
متن کاملFormation of creatine in vitro from methyl phosphate and guanidoacetic.
Methyl phosphate has been studied as a possible donor of methyl groupings for the formation of creatine by homogenates of liver tissue of rats and as a substitute for choline in the growth of rats receiving homocystine as the source of sulfur in their diet. It was found that methyl phosphate was an apparent source of methyl groupings in the in vitro synthesis of creatine but could not be substi...
متن کاملStability of limonin glucoside in beverage matrices
BACKGROUND: We completed a study over a 200-day period examining the stability of limonin glucoside formulated into three beverage matrices. RESULTS: Beverages containing limonin glucoside were found to contain limonin (0.13–20.10 mg L−1) during their initial testing; however, these concentrations were directly attributable to the presence of contaminating limonin in the particular lot of limon...
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ژورنال
عنوان ژورنال: Nippon kagaku zassi
سال: 1962
ISSN: 0369-5387,2185-0917
DOI: 10.1246/nikkashi1948.83.5_630