Studies on nitrogen metabolism using carbon-13 NMR spectroscopy. 6. Biosynthesis of sarubicin A. Synthesis and incorporation of 6-hydroxy[13CO15NH2]anthranilamide
摘要:
We have previously demonstrated that 6-hydroxyanthranilic acid (3) is specifically incorporated into sarubicin A (1) by Streptomyces helicus. 6-Hydroxyanthranilamide (4) has now been synthesized in five steps from m-anisidine in a manner that allowed efficient introduction of isotope labels to prepare [(CONH2)-C-13-N-15]-4a. A new synthesis of 3 from m-anisidine has also been developed. 4a was fed to S. helicus, and a 1.29% incorporation into 1b was obtained. Examination of the C-13 NMR spectrum of 1b revealed predominantly intact incorporation, with a minor amount of 4a (0.13%) first undergoing in vivo hydrolysis to the corresponding acid. Thus, carboxamide formation is the next step in the biosynthesis of 1.
Studies on nitrogen metabolism using carbon-13 NMR spectroscopy. 6. Biosynthesis of sarubicin A. Synthesis and incorporation of 6-hydroxy[13CO15NH2]anthranilamide
摘要:
We have previously demonstrated that 6-hydroxyanthranilic acid (3) is specifically incorporated into sarubicin A (1) by Streptomyces helicus. 6-Hydroxyanthranilamide (4) has now been synthesized in five steps from m-anisidine in a manner that allowed efficient introduction of isotope labels to prepare [(CONH2)-C-13-N-15]-4a. A new synthesis of 3 from m-anisidine has also been developed. 4a was fed to S. helicus, and a 1.29% incorporation into 1b was obtained. Examination of the C-13 NMR spectrum of 1b revealed predominantly intact incorporation, with a minor amount of 4a (0.13%) first undergoing in vivo hydrolysis to the corresponding acid. Thus, carboxamide formation is the next step in the biosynthesis of 1.
Sulfonamide peri-substituted bicyclics for occlusive artery disease
申请人:Singh Jasbir
公开号:US20060079520A1
公开(公告)日:2006-04-13
Acyl sulfonamide, peri-substituted, fused bicyclic ring compounds useful for the treatment or prophylaxis of a prostaglandin-mediated disease or condition are disclosed. The compounds are of the general formula
A representative example is:
Therapeutic compounds for the treatment of asthma and allergy, and methods of use thereof
申请人:——
公开号:US20020082268A1
公开(公告)日:2002-06-27
The present invention relates to compounds capable of inhibiting leukotriene activity and histamine activity, and their use in treating asthma and allergic conditions such as hay fever, dermatitus, and urticaria. Inhibition of both pathways permits more effective treatment of conditions with fewer side effects than can be achieved using most available antihistamines alone.
Carboxylic acid peri-substituted bicyclics for occlusive artery disease
申请人:Singh Jasbir
公开号:US20060142355A1
公开(公告)日:2006-06-29
Peri-substituted, fused bicyclic ring carboxylic acids useful for the treatment or prophylaxis of a prostaglandin-mediated disease or condition are disclosed. The compounds are of the general formula
A representative example is:
SULFONAMIDE PERI-SUBSTITUTED BICYCLICS FOR OCCLUSIVE ARTERY DISEASE
申请人:Singh Jasbir
公开号:US20090291948A1
公开(公告)日:2009-11-26
Acyl sulfonamide, peri-substituted, fused bicyclic ring compounds useful for the treatment or prophylaxis of a prostaglandin-mediated disease or condition are disclosed. The compounds are of the general formula
A representative example is: