Abstract: Provided are cephem derivatives represented by the general formula ##STR1## wherein Ar, R.sup.1, R.sup.2, R.sup.3, R.sup.9 and R.sup.10 are as defined in the application. The derivatives are gram-positive antibacterial agents especially useful in the treatment of diseases caused by methicillin-resistant Staphylococcus aureus.

Abstract: A series of compounds of Formula I which have anti-tumor activity, and are useful in treating viral infections, their compositions and use. ##STR1## In Formula I B is a purine or pyrimidine base; alk.sub.1 alk.sub.2 and alk.sub.3 are chemical bonds or alkylene groups; Q is hydrogen or hydroxyl; and R.sub.1 -R.sub.4 are hydrogen or alkyl.

Abstract: There are disclosed novel oral prodrugs of phosphonate nucleotide analogs which are hydrolyzable under physiological conditions to yield compounds which are useful as antiviral agents, especially as agents effective against RNA and DNA viruses. They may also find use as antitumor agents.

Abstract: A compound of the Formula I or Formula II ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen, hydroxy, chlorine, fluorine, bromine, or an organic substituent having 1 to 5 carbon atoms and selected from acyloxy having a hydrocarbon stem of 1 to 4 carbon atoms, alkoxy, alkylthio, amino, alkylamino and dialkylamino;R.sup.3 and R.sup.4 are independently hydrogen, or organic phosphonic ester substituents having 1 to 12 carbon atoms and selected from alkyl, alkenyl, aryl, and aralkyl; andB is a heterocyclic group selected from the group consisting of pyrimidine, purine, triazine, deazapurine, and triazole, attached through a ring nitrogen atom thereof optionally substituted with 1 to 3 substituents selected from the group consisting of hydroxy, mercapto, amino, hydrazino, fluoro, chloro, bromo, iodo, C.sub.1 to C.sub.3 alkyl, C2-C3 alkenyl, C2-C3 haloalkenyl, C1-C3 alkoxy, and C1-C3 alkylthio;and the pharmaceutically acceptable acid addition, metal, and amine salts thereof.

Abstract: Compounds are provided that generally have the structure BCH.sub.2 CH(R)OCH.sub.2 P(O)(OH).sub.2, wherein B is a purinyl or pyrimidinyl base and R is C.sub.1-2 alkyl substituted with azido or amino, straight or branched alkenyl of 2-6 carbon atoms or alkynyl of 2-6 carbon atoms, together with the monester and diesters of such compounds with a C.sub.1-5 alkanol, and the corresponding salts, hydrates, solvates, the (R) or (S) isomers and the racemic (RS) mixtures thereof. The compounds have desirable antiviral activity.

Abstract: Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## wherein Ar is a lipophilic optionally substituted phenyl, naphthyl or pyridyl group; R.sup.1 represents either the residue of a heterocyclic amino acid or a C.sub.2 -C.sub.10 alkyl group substituted by both a carboxyl group and a group of the formula --NR.sup.9 R.sup.10 or ##STR3## in which R.sup.9 and R.sup.10 are each independently hydrogen or C.sub.1 -C.sub.6 alkyl, said C.sub.2 -C.sub.10 alkyl group being optionally interrupted by one or more nitrogen atoms or carbonyl groups, and R.sup.2 and R.sup.3 are each independently hydrogen, alkyl or aminoalkyl are gram-positive antibacterial agents, especially useful in the treatment of diseases caused by methicillin-resistant Staphylococcus aureus (also referred to below as MRSA or methicillin-resistant S. aureus).

Abstract: Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## wherein Ar is a lipophilic optionally substituted phenyl, naphthyl, pyridyl or benzthiazolyl group; R.sup.1 is selected from certain optionally substituted aliphatic, aromatic, arylaliphatic or sugar moieties and R.sup.2 and R.sup.3 are each independently hydrogen, alkyl or aminoalkylcarbonylamino are gram-positive antibacterial agents, especially useful in the treatment of infectious diseases caused by methicillin-resistant Staphylococcus aureus (MRSA).

Abstract: There are disclosed novel oral prodrugs of phosphonate nucleotide analogs which are hydrolyzable under physiological conditions to yield compounds which are useful as antiviral agents, especially as agents effective against RNA and DNA viruses. They may also find use as antitumor agents.

Abstract: A series of compounds of Formula I which have anti-tumor activity, and are useful in treating viral infections, their compositions and use. ##STR1## In Formula I B is a purine or pyrimidine base; alk.sub.1 alk.sub.2 and alk.sub.3 are chemical bonds or alkylene groups; Q is hydrogen or hydroxyl; and R.sub.1 -R.sub.4 are hydrogen or alkyl.

Abstract: Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## wherein Ar is a lipophilic optionally substituted phenyl, naphthyl or pyridyl group; R.sup.1 represents either the residue of a heterocyclic amino acid or a C.sub.2 -C.sub.10 alkyl group substituted by both a carboxyl group and a group of the formula --NR.sup.9 R.sup.10 or ##STR3## in which R.sup.9 and R.sup.10 are each independently hydrogen or C.sub.1 -C.sub.6 alkyl, said C.sub.2 -C.sub.10 alkyl group being optionally interrupted by one or more nitrogen atoms or carbonyl groups, and R.sup.2 and R.sup.3 are each independently hydrogen, alkyl or aminoalkyl are gram-positive antibacterial agents, especially useful in the treatment of diseases caused by methicillin-resistant Staphylococcus aureus (also referred to below as MRSA or methicillin-resistant S. aureus).

Abstract: Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## wherein Ar is a lipophilic optionally substituted phenyl, naphthyl, pyridyl or benzthiazolyl group; R.sup.1 is selected from certain optionally substituted aliphatic, aromatic, arylaliphatic or sugar moieties and R.sup.2 and R.sup.3 are each independently hydrogen, alkyl or aminoalkylcarbonylamino are gram-positive antibacterial agents, especially useful in the treatment of infectious diseases caused by methicillin-resistant Staphylococcus aureus (MRSA).

Abstract: Novel cephem derivatives represented by the general formula ##STR1## in which the Acyl substituent is a group of the formula ##STR2## where Ar is a substituted phenyl or optionally substituted naphthyl or benzthiazolyl group and A is a substituted-pyridinium group are gram-positive antibiotics, especially useful in the treatment of diseases caused by methicillin-resistant Staphylococcus aureus.

Abstract: Certain novel alicyclic compounds are effective phospholipase A.sub.2 (PLA.sub.2) inhibitors.

Abstract: Certain novel biaryl compounds are effective phospholipase A.sub.2 (PLA.sub.2) inhibitors.

Abstract: The present invention provides chiral nucleotide analogs having the Formulas I and II ##STR1## and pharmaceutically acceptable salts and solvates thereof, and their pharmaceutical compositions for use in the treatment of viral infections, especially those caused by human immunodeficiency virus (HIV).