نتایج جستجو برای: hydroxy appatite
تعداد نتایج: 31233 فیلتر نتایج به سال:
Twelve neuroactive and neuroprotective steroids, androgens and androgen precursors i.e. 3alpha,17beta-dihydroxy-5alpha-androstane, 3alpha-hydroxy-5alpha-androstan-17-one, 3alpha-hydroxy-5beta-androstan-17-one, androst-5-ene-3beta,17beta-diol, 3beta,17alpha-dihydroxy-pregn-5-en-20-one (17alpha-hydroxy-pregnenolone), 3beta-hydroxy-androst-5-en-17-one (dehydroepiandrosterone, DHEA), testosterone, ...
BACKGROUND Enantiopure 2-hydroxy acids are key intermediates for the synthesis of pharmaceuticals and fine chemicals. We present an enantioselective cascade biocatalysis using recombinant microbial cells for deracemization of racemic 2-hydroxy acids that allows for efficient production of enantiopure 2-hydroxy acids. RESULTS The method was realized by a single recombinant Escherichia coli str...
3-Hydroxy-2-pyrone is a valuable building block of many molecules. The syntheses until now proposed to prepare this compound are not ecofriendly and unsuitable for large scale productions. We report an easy gram preparation pyrone, by simple heating in water bio-based 6-caboxylic-3-hydroxy-2-pyrone derivatives. full process can be also performed telescopic reaction starting from galactaric acid...
The new major metabolite of @-acetylaminofluorene (AAF) in the rat, N-hydroxy AAF, was excreted in the urine as a conjugate in amounts that increased during car cinogenesis; the amount at 18 weeks was about 9 times that at 1@weeks. When 3methylcholanthrene, which greatly inhibits the carcinogenicity of AM?, was fed with AAF, the excretion of N-hydroxy-AAF remained low, while the excretion of 3a...
(7-Hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid hydrazide (2) was prepared from (7-hydroxy-2-oxo-2H-chromen-4-yl)-acetic acid ethyl ester (1) and 100% hydrazine hydrate. Compound 2, is the key intermediate for the synthesis of several series of new compounds such as Schiff's bases 3a-l, formic acid N'-[2-(7-hydroxy-2-oxo-2H- chromen-4-yl)acetyl] hydrazide (4), acetic acid N'-[2-(7-hydroxy-2-oxo-2...
Two new polyketides: 2Z-(heptadec-12-enyl)-4-hydroxy-3,4,7,8-tetrahydro-2H-chromen-5(6H)-one (1) and 2-(heptadec-12-enyl)-5-hydroxy-5,6,7,8-tetrahydrochromen- 4-one (2), together with eleven known compounds: 4-hydroxy-2-[(3,4-methylenedioxy- phenyl)tridecanoyl] cyclohexane-1,3-dione (3), oleiferinone (4), 4-hydroxy-2-[(3,4- methylenedioxyphenyl)undecanoyl]cyclohexane-1,3-dione (5), 4-hydroxy-2-...
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