摘要:
Compounds represented by the formula [1] R1 is H or a substituent; R2 and R3 are C1-C3 alkyl; R4 is siderophore group e.g. CH3—(CH2)n—C(O)—N(OH)—(CH2)m— with n=10-22, m=2-6; X is O, S, or NH; X1 is O or NH; Y is H or alkyl; Z is H or substituted amino, e.g., t-BocNH or CbzNH, and r is 2-4; are useful in the method provided for treating tuberculosis. [1] is prepared by coupling [7], wherein HX1 is HO— or H2N—, with [4] obtained as the free acid after saponification of the methyl ester.
摘要:
5'-O-Acyl-5-fluorouridines and 5'-O-acyl-5-sluorocytidines are prepared by the direct acylation of the 5'-hydroxyl group with amino acids under Mitsunobu conditions and the amino acyl derivatives are coupled with other amino acids or peptides to provide antibacterial and antifungal derivatives of the nucleosides. For example, 5-fluorouridine is acylated at the 5'-hydroxyl group with an amino protected L-valine and the acylation product is deprotected to provide 5'-O-(L-valinyl)-5-fluorouridine having activity against Gram-positive bacteria including resistant staphylococcus. Preferred peptide derivatives comprise the tripeptides of ornithine and lysine wherein the terminal amino group is substituted by both hydroxy and acetyl. The latter peptides inhibit the growth of C. albicans.
摘要:
A process for 4-halomethylazetidin-2-ones is provided which comprises mixing in an inert solvent a positive halogen reagent in the presence of a weak base with a .beta.,.gamma.-unsaturated O-acylhydroxamate of the formula ##STR1## wherein R is protected amino, lower alkyl or phenyl substituted lower alkyl, R.sub.2 is a substituent such as lower alkyl which may be substituted by formyl, hydroxy, halogen, etc., and R.sub.1 is alkoxy, benzyloxy, etc. When R is a protected amino group, the process provides cis-4-halomethylazetidin-2-ones, while when R is alkyl or phenylalkyl, the trans isomer is obtained. The 4-halomethylazetidinones are useful intermediates for known antibiotic compounds.
摘要:
Process for N-acyloxy or sulfooxy 2-azetidinones comprising O-acylation of a .beta.-hydroxy or .beta.-halo hydroxamic acid, and cyclizing the O-acylhydroxamate with TPP-CCl.sub.4 -TEA or with TPP-dialkylazodicarboxylate to the N-acyloxy-2-azetidinone. Solvolysis of the acyl group provides an N-hydroxy-2-azetidinone. E.g., N-Cbz-L-serine is converted to the O-acetyl hydroxamate, cyclized and solvolyzed to N-hydroxy-3-(Cbz-amino)-2-azetidinone. The N-hydroxy-2-azetidinones are useful intermediates to monocyclic .beta.-lactam antibiotics and .beta.-lactamase inhibitors.
摘要:
Embodiments relate to the field of chemistry and biochemistry, and, more specifically, to anti-cancer compounds, synthesis thereof, and methods of using same. Disclosed herein are various heterocyclic compounds and methods of using the novel anti-cancer compounds to inhibit the growth of a cancer cell, for instance a leukemia, non-small cell lung, central nervous system (CNS), skin, ovarian, renal, prostate, breast, or colon cancer cell. Other embodiments include methods of treating cancer in a subject, such as using the disclosed heterocyclic anti-cancer agents.
摘要:
Substituted 2-(azetidin-2-on-1-yl)alkoxyalkylalkanoic acids and 2-(azetidin-2-on-1-yl)arylalkylalkanoic acids, and analogs and derivatives thereof are described. Methods for using the described compounds, and pharmaceutical compositions thereof, to treat disease states responsive to antagonism of one or more vasopressin receptors are also described.
摘要:
Embodiments relate to the field of chemistry and biochemistry, and, more specifically, to imidazopyridine compounds, synthesis thereof, and methods of using same. Disclosed herein are various imidazo[1,2-a]pyhdine compounds and methods of using the novel compounds to treat or prevent tuberculosis in a subject or to inhibit fungal growth on plant species. Other embodiments include methods of synthesizing imidazo [1,2- a]pyridine compounds, such as the disclosed imidazo[1,2-a]pyridine compounds.
摘要:
Embodiments relate to the field of chemistry and biochemistry, and, more specifically, to anti-cancer compounds, synthesis thereof, and methods of using same. Disclosed herein are various heterocyclic compounds and methods of using the novel anti-cancer compounds to inhibit the growth of a cancer cell, for instance a leukemia, non-small cell lung, central nervous system (CNS), skin, ovarian, renal, prostate, breast, or colon cancer cell. Other embodiments include methods of treating cancer in a subject, such as using the disclosed heterocyclic anti-cancer agents.
摘要:
.beta.-Hydroxy-.alpha.-amino acids are obtained via serine hydroxymethyltransferase catalyzed condensation of aldehydes with glycine. The predominant product with most aldehydes is the L-erythro diastereomer. For example, succinic semialdehyde methylester is condensed with glycine in the process to provide L-erythro .alpha.-amino hydroxy adipic acid mono methyl ester.
摘要:
1-Carbapenam-2-one-3-carboxylic acid and 1-carba-3-hydroxy-3-cephem-4-carboxylic acid and esters thereof are provided by a process comprising a rhodium C.sub.2 -C.sub.10 carboxylate catalyzed cyclization of an ester of a 4-(1-alkoxy- or 1-substituted alkoxy)-2-oxo-4-azetidinyl)-.beta.-ketobutyric acid and an ester of a 5-(1-alkoxy- or 1-substituted alkoxy-2-oxo-4-azetidinyl)-.alpha.-diazo-.beta.-ketovaleric acid respectively. The process is carried out in an inert organic solvent at a temperature between about 15.degree. C. and about 85.degree. C. The 1-carba bicyclic .beta.-lactams are intermediates for preparing antibiotics.